Soaring over 6,000 feet in the Bavarian Alps, this beer garden was once Hitler's 50th birthday present.

A nearly 500-year-old sculpture depicts a man eating a sack of babies, and no one is sure why.

Built to repay the sins of the father, this church is home to one of the most valuable works of Western art.

The oldest botanical garden in the world that technically isn't the oldest.

Pilgrimage site for star-crossed lovers.

Five candy-colored villages on the Italian Riviera.

A lover's walk between hilltop towns, decorated with graffiti love notes.

Fortified medieval tower house with lovely roof garden.

A mysterious chasm in the heart of the ancient Roman Forum, the Lacus Curtius was once believed to be a gateway to hell.

These "anatomical machines" are only one of the many strange items in this Italian crypt.

Ancient snack bar of the Roman Empire re-opened.

Erotic art covers the walls of the largest ancient pleasure palace.

The last moments of the ill-fated Pompeiians, frozen forever in plaster.

The world's most active stratovolcano is almost always erupting.

Italian cave with exceptional acoustics and an unsavory history.

142 ceramic steps become a mosaic once a year.

Every inch of this chapel is covered in craftsmanship from across the world.

A pedestrian island in the middle of world-famous Times Square emits a strange (and purposeful) humming noise.

This sculpture by artist Fritz Keonig survived the 9/11 attacks and now stands as a monument to the victims.

Gilded heaven for philatelists and architecture freaks, still in full working order despite sitting atop tremulous ground.

The only castle in North America to ever house European sovereigns.

A museum in the former home of Marxist revolutionary Leon Trotsky.

Frida Kahlo's childhood home, now a museum of her life and works.

The ruins of an ancient city built by Mayan traders is centered around a temple of a sacred feathered serpent deity.