A sixth-century Byzantine cistern hidden below a modern carpet store.

Ancient serpentine sacrifice holder that has stood the test of time.

This slender three-story building has also had several famous residents.

This giant middle finger statue sends an unambiguous message to Italy's bankers.

Collapsing castle on the Hudson river was once the storage site of military surplus business.

A little sculpture with a large wardrobe.

A walk through the historic city center, under the streets of Seattle.

This small-town pizzeria won the Hollywood lottery.

Holding multiple historical boats and an entire 19th century village, this New England attraction is the largest maritime museum in the world.

A crumbling hospital from the 1850s on Roosevelt Island.

Read between the lines of the subway map to find the hidden abandoned Civil War fort.

Hidden in plain sight on the Hudson River is an abandoned train station where nature has taken over.

Once America's longest-manned military fort, now an abandoned hulk.

The home of aviation trailblazers, in a remote corner of the big city.

Sniff the Titan Arum's rotting flesh.

A marvel of Byzantine engineering under the streets of Istanbul.

Mysterious rocks that ring musically when struck.

An Inca spa, military outpost or maybe… both?

Built on the remains of one the Incas’ most important gathering spots, this square keeps the spirit of a fallen empire alive.

A Christian monastery stands on what was once a holy Incan temple.

Situated on a sacred Inca site, this 16th-century cathedral took nearly 100 years to build.

The stones of this Incan wall complex fit together so well you couldn't fit a piece of paper between some of them.

This geometric feat is a testament to the Incas' mesmerizing architectural abilities.

An innovative attempt to break a siege in the American Civil War still scars the earth today.