Cloaca Maxima

Historical landmark · Ripa

Cloaca Maxima

Historical landmark · Ripa

3

Via del Velabro, 3, 00186 Roma RM, Italy

Photos

Cloaca Maxima by null
Cloaca Maxima by Collector of Experiences (Atlas Obscura User)
Cloaca Maxima by Collector of Experiences (Atlas Obscura User)
Cloaca Maxima by Collector of Experiences (Atlas Obscura User)
Cloaca Maxima by Dr Alan P Newman (Atlas Obscura User)
Cloaca Maxima by Pedro Cambra/CC BY 2.0
Cloaca Maxima by Lalupa (Public Domain)
Cloaca Maxima by Christoffer Wilhelm Eckersberg/CC BY-SA 4.0
Cloaca Maxima by Collector of Experiences (Atlas Obscura User)
Cloaca Maxima by Pedro Cambra/CC BY 2.0
Cloaca Maxima by Christoffer Wilhelm Eckersberg/CC BY-SA 4.0
Cloaca Maxima by Dr Alan P Newman (Atlas Obscura User)
Cloaca Maxima by Dr Alan P Newman (Atlas Obscura User)
Cloaca Maxima by Collector of Experiences (Atlas Obscura User)
Cloaca Maxima by Collector of Experiences (Atlas Obscura User)
Cloaca Maxima by Dr Alan P Newman (Atlas Obscura User)
Cloaca Maxima by Lalupa (Public Domain)
Cloaca Maxima by Dr Alan P Newman (Atlas Obscura User)
Cloaca Maxima by Dr Alan P Newman (Atlas Obscura User)
Cloaca Maxima by Lalupa (Public Domain)
Cloaca Maxima by Dr Alan P Newman (Atlas Obscura User)
Cloaca Maxima by Dr Alan P Newman (Atlas Obscura User)
Cloaca Maxima by katielou106 (Atlas Obscura User)
Cloaca Maxima by Collector of Experiences (Atlas Obscura User)
Cloaca Maxima by Collector of Experiences (Atlas Obscura User)
Cloaca Maxima by Christoffer Wilhelm Eckersberg/CC BY-SA 4.0
Cloaca Maxima by katielou106 (Atlas Obscura User)
Cloaca Maxima by Pedro Cambra/CC BY 2.0
Cloaca Maxima by Dr Alan P Newman (Atlas Obscura User)
Cloaca Maxima by katielou106 (Atlas Obscura User)
Cloaca Maxima by Collector of Experiences (Atlas Obscura User)
Cloaca Maxima by null
Cloaca Maxima by null
Cloaca Maxima by null
Cloaca Maxima by null
Cloaca Maxima by null
Cloaca Maxima by null
Cloaca Maxima by null
Cloaca Maxima by null
Cloaca Maxima by null
Cloaca Maxima by null
Cloaca Maxima by null
Cloaca Maxima by null
Cloaca Maxima by null
Cloaca Maxima by null
Cloaca Maxima by null
Cloaca Maxima by null
Cloaca Maxima by null
Cloaca Maxima by null
Cloaca Maxima by null

Highlights

Ancient Roman sewer still drains water, accessible in Forum  

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Via del Velabro, 3, 00186 Roma RM, Italy Get directions

sovraintendenzaroma.it

Information

Static Map

Via del Velabro, 3, 00186 Roma RM, Italy Get directions

sovraintendenzaroma.it

Features

wheelchair accessible parking lot
wheelchair accessible entrance

Last updated

Aug 11, 2025

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@atlasobscura

39 Places That Will Warp Your Perspective of Time

"When the Romans built the Cloaca Maxima in the 6th century BC, they were very pleased with themselves for coming up with such an effective water drainage system. They were so pleased, they named it the “Greatest Sewer,” which is what Cloaca Maxima translates to. It is one of the oldest monuments in Rome, albeit lacking the glamor of the Colosseum or the Pantheon. The sewer was constructed as an open drainage system during the reign of Tarquinius Priscus, and was originally used to empty the marshlands and carry stormwater from the central Forum section of the city to the river Tiber. Much later, around the 3rd century BC, the open drain was covered, and waste from latrines and public baths were directed through the system. Later still, in the 1st century, during the rule of Augustus Caesar and under the stewardship of his trusted lieutenant Agrippa, the ancient sewer system received a thorough cleaning and was expanded to include the flow from 11 aqueducts. The Roman philosopher Pliny the Elder, writing 700 years after the system’s construction, was amazed by the sturdiness of the sewers. He wrote, “Sometimes water from the Tiber flows backwards and makes its way up the sewers. Then the powerful flood-waters clash head-on in the confined space, but the unyielding structure holds firm.” Although it remained in continuous use, the underground structure suffered damage and neglect under the Byzantines, along with other parts of the ancient city. Parts of it were revived during the Renaissance and later excavations partially restored it. In 2012, a powerful Archeorobot was sent through the tunnels to check its condition and found that it was extremely fragile and needed extensive maintenance, which was then begun. Today, a small trickle of water flows through the “greatest sewer,” with its outfall running near the Ponte Rotto bridge. It can also be accessed near the Basilica Julia at the Roman Forum, where a door leads to the sewer, and its noises, and odors, can be experienced." - ATLAS_OBSCURA

https://www.atlasobscura.com/lists/time-long-now-locations
View Postcard for Cloaca Maxima
@atlasobscura

10 Places to Explore the Dark Underbelly of Rome

"When the Romans built the Cloaca Maxima in the 6th century BC, they were very pleased with themselves for coming up with such an effective water drainage system. They were so pleased, they named it the “Greatest Sewer,” which is what Cloaca Maxima translates to. It is one of the oldest monuments in Rome, albeit lacking the glamor of the Colosseum or the Pantheon. The sewer was constructed as an open drainage system during the reign of Tarquinius Priscus, and was originally used to empty the marshlands and carry stormwater from the central Forum section of the city to the river Tiber. Much later, around the 3rd century BC, the open drain was covered, and waste from latrines and public baths were directed through the system. Later still, in the 1st century, during the rule of Augustus Caesar and under the stewardship of his trusted lieutenant Agrippa, the ancient sewer system received a thorough cleaning and was expanded to include the flow from 11 aqueducts. The Roman philosopher Pliny the Elder, writing 700 years after the system’s construction, was amazed by the sturdiness of the sewers. He wrote, “Sometimes water from the Tiber flows backwards and makes its way up the sewers. Then the powerful flood-waters clash head-on in the confined space, but the unyielding structure holds firm.” Although it remained in continuous use, the underground structure suffered damage and neglect under the Byzantines, along with other parts of the ancient city. Parts of it were revived during the Renaissance and later excavations partially restored it. In 2012, a powerful Archeorobot was sent through the tunnels to check its condition and found that it was extremely fragile and needed extensive maintenance, which was then begun. Today, a small trickle of water flows through the “greatest sewer,” with its outfall running near the Ponte Rotto bridge. It can also be accessed near the Basilica Julia at the Roman Forum, where a door leads to the sewer, and its noises, and odors, can be experienced." - ATLAS_OBSCURA

https://www.atlasobscura.com/lists/rome-underground-st-valentines
View Postcard for Cloaca Maxima
@atlasobscura

13 Places to Wade Into the Wondrous History of Sewers

"When the Romans built the Cloaca Maxima in the 6th century BC, they were very pleased with themselves for coming up with such an effective water drainage system. They were so pleased, they named it the “Greatest Sewer,” which is what Cloaca Maxima translates to. It is one of the oldest monuments in Rome, albeit lacking the glamor of the Colosseum or the Pantheon. The sewer was constructed as an open drainage system during the reign of Tarquinius Priscus, and was originally used to empty the marshlands and carry stormwater from the central Forum section of the city to the river Tiber. Much later, around the 3rd century BC, the open drain was covered, and waste from latrines and public baths were directed through the system. Later still, in the 1st century, during the rule of Augustus Caesar and under the stewardship of his trusted lieutenant Agrippa, the ancient sewer system received a thorough cleaning and was expanded to include the flow from 11 aqueducts. The Roman philosopher Pliny the Elder, writing 700 years after the system’s construction, was amazed by the sturdiness of the sewers. He wrote, “Sometimes water from the Tiber flows backwards and makes its way up the sewers. Then the powerful flood-waters clash head-on in the confined space, but the unyielding structure holds firm.” Although it remained in continuous use, the underground structure suffered damage and neglect under the Byzantines, along with other parts of the ancient city. Parts of it were revived during the Renaissance and later excavations partially restored it. In 2012, a powerful Archeorobot was sent through the tunnels to check its condition and found that it was extremely fragile and needed extensive maintenance, which was then begun. Today, a small trickle of water flows through the “greatest sewer,” with its outfall running near the Ponte Rotto bridge. It can also be accessed near the Basilica Julia at the Roman Forum, where a door leads to the sewer, and its noises, and odors, can be experienced." - ATLAS_OBSCURA

https://www.atlasobscura.com/lists/sewer-history
View Postcard for Cloaca Maxima

Davis D. Janowski

Google
Amazing to think this has been in use for more than 2500 years in various states of construction

Aleksey2 Radovanocich2

Google
Saw a weird guy with Pink hair,the only think know was that he entered inside and then I heard multiple screams,scared the hell out of me,a very bizarre adventure

Piotr Wargin

Google
Cloaca Maxima is often mentioned in history books and yet it's nearly impossible to find sites related to it. This unmarked arch at Tiber 's embankment is supposedly the place where it coonects to the Tiber river. Here, among homeless people encampment you can actualy see a small sewage outlet. Does it mean that the ancient sewage system is still working, buried under Rome's streets? If so, I would love to learn more about it current state, better yet - tour it. btw nearby, behind the Arch of Janus, is a place that seems to be connected to Cloaca Maxima (see photos)

Michael Everette

Google
Cool historical significance, but not worth visiting. Overgrown with bushes. Only thing visible from the path is some graffiti and tents.

Marc Albert

Google
Stand on the Trastevere side of the Ponte Palatino and you can see the opening for the Cloaca Maxima (The Greatest Sewer) on the right side of the opposite end of the bridge. The sewer still operates today by draining water from some parts of Rome. Look up the history of the sewer - it's more interesting than you might imagine. It's a nice piece of history.

Todor Popov

Google
Well do not expect anything fancy, or anything at all, there is a sight next to the river that is nothing spectacular, and one that is in the Caesar's Forum, that can be seen from the street, that is a bit cleaner and deserves to be acknowledged.

Googlee

Google
The architectural design is so beautiful, and can't believe,it's a centuries old and still standing

Simon

Google
There is not much to see