A very interesting structure near the Charles Bridge which is a must go for everyone who's here - especially if you're a Beatles and John Lennon fan. It's pretty amazing how few people grow beyond their field into something so much more - and read the wiki background while you are standing near it. It's very interesting. The visit will only take a minute - and please don't expect much as it's just a wall. Few of the images are for adults only - so take kids with proper guidance!