Dave O.
Yelp
If you're Catholic, or just appreciate seriously old and cool architecture, you really need to stop by Saint Peter's Cathedral in Regensburg.
The historical relevance alone is worth a look see, as it has seen several phases over the years with the first church in this location built approximately 700 AD. It's current form was finished and ready for service in the early 16th century.
It's open to the public, totally free to go inside and mass is still conducted there. Once inside you'll want to take your time just admiring the Michelangeloesque artwork everywhere. The ceiling, the walls, the statues, it's just so cool! It's everywhere you look.
The exterior is currently going through a renovation of sorts, or maybe a reinforcement safety measure, so exterior photos aren't as grand as you might want. However, everything about this Cathedral is indeed grand!
If you're in Regensburg, this is a must see. By the way, it's also centrally located where the Christmas Market is as well.
Go here, you'll be glad you did.
Cheers!