The marble facade hides a little-known medical museum with early surgical instruments and rare copies of canonical texts.

Where Venice's gondolas go for a tune-up.

An extensive collection of reliquaries containing the bones of saints housed in the largest Catholic church in Venice.

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

The only museum with its curator—and her pets—buried inside.

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

This Venice bookstore has resigned itself to constant flooding by keeping its books in bathtubs and boats.

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

Death rituals and sacrifice inside a Peruvian megalith.

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

This stone complex marks the urban center of a lost civilization.

It's just another skyscraper, but it's shaped like '90s cell phone.

Pivotal home of Nobel Prize winner Pablo Neruda.

The rusty hull of this 1899 ship serves as a tribute to explorers of the bottom of the world.

In the most arid desert on the planet, the world's leading telescope allows astronomers to see more than has ever been seen before.

What was once a unique system of urban elevators is turning into a mechanical ruin.

A sculpture of a giant hand reaches for the stars in the middle of the Atacama desert.

This 16-foot, 6-ton statue in the singer's hometown doesn't actually look like her.

Cathedral carved out of salt, located a mile below the Earth's surface.

Lebanese castle built by one man, over a lifetime.

Mummies preserved naturally for seven centuries.

After this one-of-a-kind palace was built the architect's hands are said to have been cut off to keep it that way.

A monumental underground karstic wonderland is also the water source for over a million citizens of Beirut.

The largest hewn stone in history.