Despite attempts by local police to discourage it, Beatles-inspired graffiti has been a means for artists to air grievances for decades.

This automated sculpture of two men peeing will spell out text messages with their micturition.

A Jenga-style cylindrical tower of books that appears to go on forever.

An eerie, derelict amusement park in Berlin.

Gardens representing parts of Asia, Europe, and the Mid East are tucked away among the Soviet-style buildings in East Berlin.

Three connected pink triangles memorialize persecuted gays and lesbians throughout history.

Amsterdam's Red Light District leaves little to the imagination.