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

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

An Italian crevasse filled with abandoned buildings gives visitors a look at the world without humans.

A master of trompe-l'oeil creates a stunning, tourist-fooling dome out of a flat ceiling.

This shining multicolored metro station deep under Naples is said to be the most beautiful in Europe.

This hidden Art Nouveau courtyard is an opulent feast for the eyes.

The yawning maw of this pagan visage is said to bite off the hands of liars.

Architectureal fantasy quarter of Rome.

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

Installed in an act of one-upsmanship, the annual sundial in this church is also a symbolic victory for the Gregorian calendar.

This remarkably well-preserved Incan city managed to survive the conquistadores.

A colorful Peruvian city of the dead.

Extraordinary rock formations in open Peruvian fields.

The Uros people live on floating reed islands in lake Titicaca.

An unexpected desert oasis in South America.

If you’ve ever seen a picture of Machu Picchu, then you’ve seen a picture of Huayna Picchu—you just didn’t realize it.

A set of ancient drawings in the desert of Peru that are so massive, many of them can only be fully seen from the sky.

A market for witches is hidden within a train station.

A remote candy-striped mountain in the Peruvian Andes straight out of the pages of Dr. Seuss.

The intricate stonework of Machu Picchu serves as a testament to Incan engineers.

Museum celebrating the ocean, with the largest wunderkammer dedicated to sea exploration.

America's most famous piece of self-built architecture.

This iconic L.A. bookshop is housed in an abandoned bank—both symbolic and chic.

Non-profit time travel mart sells goods you would need for a trip through the fourth dimension.