The U.S. Supreme Court's secret Cold War relocation facility in the mountains of North Carolina.

It's believed Elvis Presley was inspired to write his breakthrough track after staying here.

The behemoth beasts engaged in an epic battle is the second-tallest statue in the contiguous United States.

These constructed wetlands naturally filter millions of gallons of treated wastewater every day.

This kitschy curio wonderland is full of fake animals, teak tables, and a cacophony of random bric-a-brac.

The ruins of this antebellum sugar plantation are the end result of a Seminole attack during the Florida Wars of 1836.

These chunky stone towers out in Lake Michigan are the key to Chicago’s drinking water.

Four glass boxes hover over 1,000 feet in the air to give visitors an unparalleled view of Chicago.

This museum celebrating the almighty dollar lets visitors literally stand in the shadow of a million bucks.

The pile of books behind the dignified writer gave the statue a most undignified nickname.

This community on a small Venetian island has taken to painting their houses in bright neon hues.

A small island less than half a mile from Venice is a forbidden island with a dark and twisted past.

This abandoned island off the Venetian coast has been a radical monastery, a political prison, and a secret Nazi base.

The oldest of Venice's plague quarantine stations, designed to keep the medieval city safe from disease.

Originally a leper colony, the island is now an Armenian monastery that's home to an incredible manuscript library and eclectic museum.

Venice's "Island of the Mad."

Venice's island of the dead.

A new sculpture calls attention to climate change in the centuries-old city it threatens.

Thousand-year-old Viking runes adorn an ancient Greek lion at the entrance to the Venetian Arsenal.

Two stone columns flank the grand Venice square, but there were supposed to be three.

This tipsy office building in downtown Prague was originally called “Fred and Ginger.”

Increasingly decayed figures stand as a powerful reminder of the human costs of Czech Communism.

An existential riddle in the world's largest ancient castle.

What looks like a suicide in progress is actually a statue of Sigmund Freud.