Malcolm P.
Yelp
If you're at all interested in history, you must visit.
It's not your typical museum, a building which houses artifacts and things collected elsewhere. It's a genuine archaeological site, but with a refurbished, modern, multimedia flare.
My favorite aspect was the walls: to get into the museum, you must descend down below the street level. The old walls are exposed, so you can see the stratigraphy right in front of you, with small placards to indicate what and when. Basically, "here is the street circa 1380. And there (a foot or so above) is the street circa 1420, with a wooden gutter," etc.
But it's not all walls. On exhibit are also medieval eating/cooking utensils, jewelry, and other finds.
It's located below the Cloth Hall (the big building in the main market square). Today, the Cloth Hall is filled with stalls where people sell tourist tchotchkes and knick-knacks, but the site has been Krakow's central market for about 1,000 years. Down in the Rynek Underground Museum, they have the old stone stalls, separated by low walls (not reconstructions, as far as I could tell), where long-dead vendors would sell their wares back in the day. To contrast the market as it was then and as it is today was just fascinating!
As for reconstructions, they authentic-looking wooden/straw mockups of historical houses and workshops (a blacksmith, some primitive saltworks).
As for the multimedia thing, in various parts of the museum they have unobtrusive reenactments of medieval Krakow projecting on some of the wallspace, and on a sort of waterfall, which makes for great effect. These, along with the historical sounds they project (horses, people talking, people haggling, people walking) really make for an impactful experience.
The ONLY downside (and I won't mark them down for this because the museum is just too #$@%% great) is the staff. On my second visit, I took my wife, who spooks easily. She found the sounds a bit too eerie, and wanted to leave immediately. We were right near the entrance, and started to go back up the stairs. The staff were bizarrely vehement that we must go "THAT WAY" to exit. So we did. "THAT WAY" turned out to be, basically, a path throughout the entire museum, until we found the exit. And where was the exit? About one step away from where we were when we indicated that we wanted to leave. So we left, perplexed and annoyed. (And it wasn't because of any language barrier. My wife speaks fluent Polish. The staff were just being jerks about it for no particular reason.)