Right near Prague Castle but somehow everyone misses this tiny neighborhood called Nový Svět (New World). Colorful fairy tale houses, narrow cobblestone streets, basically zero tourists somehow.

It's free, open 24/7, takes maybe 20 minutes to explore. Look for cannon balls still embedded in house walls from old wars. Feels like stepping into medieval storybook without paying castle admission prices. Just 5 minutes from castle but completely different world.