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.

The prototype for all Nazi concentration camps.

Go inside to really appreciate this 500-year-old technological masterpiece.

This strange bovine gargoyle is said to have been put in as a passive aggressive form of revenge.

The Pope’s secret escape route.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

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

The hallucinogenic center of the ancient world.

This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.

What once sat in the world’s spotlight is today a largely disused ghost complex.

This symbolic piece of New Orleans architecture is also home to a few ghastly stories.

The oldest cemetery in New Orleans, resting peacefully for over 200 years now.

This replica of the Greek structure is in the heart of Nashville.

A bizarre roadside attraction and the first instance of miniature golf in the world.

One person's lost luggage is another person's treasure.

A natural history museum with an extensive collection of bird dioramas.

What better place to take a seat?

A 56-foot tall statue of the god of fire looks out over Birmingham, Alabama.

The former home of the hard partying literary power couple is now one of the only museums devoted to their story.

"X" marks the spot of an echo chamber in the middle of a plaza.