The grave of the famous painter is marked by a simple stone in the ground.

A stunning gilt bronze relief denounced by Hitler as "degenerate art"—even though it was dedicated to the Nazi leader.

The largest mosque in Germany.

Inside this mansion turned museum, the works of prominent Croatian artists are on full display.

Residing along a busy thoroughfare, this sculpture urges passersby to consider the future.

This red London phone booth once stood in front of Buckingham Palace and was used by the queen.

At this cemetery, artists are invited to design their own gravestones.

Albert Einstein's head sticks out of a snail shell stacked on a rocket in this truly bizarre monument to the scientist.

This palatial spiral staircase was so unusual the name "snail" was given to the noble family who built it.

Now abandoned, the first public health hospital in the U.S. saw more than one million immigrants from around the world.

Originally envisioned by King Ludwig II to rival Versailles, Herrenchiemsee's "New Palace" remains half-gilded for lack of funds.

Hidden in plain sight on a pair of Manhattan subway tunnels are a pair of public instruments that sing to each other.

A fascinating insight into daily life in the Eastern Bloc.

A kindergarten shaped like a cat with a tail that's a slide.

MIT students continue the legacy of beloved professor "Doc" Edgerton through learning by doing.

A wunderkammer of gold and silver reliquaries and ancient saintly bones.

The crypt of the imposing Stephensdom holds royal intestines and thousands of skeletons.

A tiny church on a man-made island in the Adriatic.

A two-inch thick solid brass rod that extends an astounding one kilometer straight into the earth.