An incarceration museum on the spot of possibly the oldest prison in England.

Never actually a tree at all, this spot was the site of London's public hangings for nearly 600 years.

The popularity of Sherlock Holmes led to the creation of his fictional address, turning the orderly London street numbers askew.

Tower with a double-helix spiral, adorned with letters of the Georgian alphabet.

A literally moving statue of stacked metal giants just continually trying (and failing) to find love.

The first skyscraper to include a Ferris wheel built into the facade.

The charmingly disheveled clock tower of Tbilisi's puppet theater.

This neon lit Georgian cave claims to hold the boulder Prometheus was chained to.