One of the most beautiful bookstores in the world hides a neo-Gothic interior behind an art nouveau facade.

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

Romans built the world's tallest artificial waterfall in 271 BC.

Medieval town turned hippie commune, once home to the secret foreskin of Jesus Christ.

This quaint Italian town keeps losing ground as the sides of its plateau slowly erode.

A 16th-century horror show built in a lovely Italian garden.

This dazzling Buddhist temple was constructed from over one million ceramic tiles salvaged from a British shipwreck.

Hundreds of stone stairs and a winding medieval bridge connect this haunting Spanish island to the mainland.

Village situated on a narrow volcanic escarpment.

Stunning Roman aqueduct used for 1900 years and still standing.

This macabre masterpiece of a mural is one of Francisco Goya's "Black Paintings."

An ancient Egyptian temple in the middle of Madrid, Spain.

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

Built to give thanks for the passing of a plague epidemic, this cathedral is a one-of-a-kind architectural hybrid.

The outside of this exposed Moche pyramid is covered with striking colorful adobe friezes.

The large collection of pre-Columbian pottery might make you blush.

Hundreds of mummies in a silent room, some with eerily pained expressions preserved on their faces.

An Archaeological Wonder of Peru, and the largest stone ruin site in the New World.

Did Inca children also slide down these smooth rocky slopes above Cusco?

Death rituals and sacrifice inside a Peruvian megalith.

This Peruvian canyon is filled with geometric salt pools that have been being harvested since the Incan empire.

One of the world's tallest waterfalls wasn't revealed to the world at large until 2006.

An unexpected desert oasis in South America.

Huge stone depressions which may have acted as an Incan agricultural experiment.