The medieval city is a UNESCO World Heritage Site. The Hanseatic League (a guild of merchants) used Tallin as a stop on their trade routes.
Nav:
Gates, walls, buildings…Much of the old city is well preserved.
Nosh:
If you want a traditional (but tourist oriented) meal, check out Olde Hansa. I didn’t go but tried several other places around town.
Nip:
The beer scene is good. Brewdog is a cool venue…looks like it was an old train station or something.