The John Lennon Wall in Prague, Czech Republic

Just like the one in Sofia, Bulgaria this wall was started as a protest against the communist regime. The students who started this were described by the Czech authorities at the time as "alcoholics, mentally deranged, sociopathic, and agents of Western capitalism".  

The wall is located at Velkopřevorské náměstí (Grand Priory Square) near the Charles Bridge and is owned by the Knights of Malta who "allow" (I don't think it would stop even if it was banned) the graffiti to continue which means that each time you visit the wall it's like you are seeing it for the first time. These pictures are from a trip I had there in Feb 2008.

I really like the idea of a wall which is always changing and has messages of peace and love from anybody wishing to leave one (which you can take your time reading). If you are planning a trip to Prague then I would recommend a visit to the wall and also that you take a pen along so that you can leave your own message for the next people to see.