The iconic boulevard is the perfect place to catch sight of a bicycling skeleton, a levitating Satan, or a chef with his head stuck in a pizza.

A series of caves under Castle Hill that once held the prisoner Vlad Tepes, better known as Count Dracula.

This historic address is home to the beloved ball and is an almost totally empty building among the most expensive real estate in the world.

This massive underground salt mine now holds a sci-fi theme park in its depths.

This plaza at the end of the world teems with monumental tributes to a problematic history, and laser discs.

This Japanese-inspired labyrinth of hot springs is hidden in a Chilean forest.

This whimsical group of statues is a favorite of children who love to climb all over Lewis Carroll's beloved characters.

This picturesque Umbrian city has a subterranean side that has long remained hidden.

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

This Transylvanian church has changed its denomination four times.