The doodles of a genius line the walls of a secret room under the Medici Chapel, where they were hidden for nearly 500 years.

Thousands of well-dressed mummies below a monastery.

Pompeii's less famous neighbor is still revealing her secrets.

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

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

A submerged archeological park still holds the wonders of a Roman Sodom.

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

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

This incredible college library is a visual masterpiece of mosaic art. It also looks kind of like a giant boombox.

A barbarous band of serpents guard the bases of these Aztec temples.

At least seven hues of blue and turquoise make this freshwater lagoon unique.

The ruins of an ancient temple to the Aztec wind god discovered in the middle of a metro station.

A hidden treasure of an abandoned city lies deep in the jungles of Campeche, Mexico.

If you can look past the nearby sewer pipes, this urban sinkhole grotto is a mini-paradise.

The meteor that sealed the fate of the dinosaurs landed at this site, one of the largest impact craters in the world.

By night, this auto repair shop turns into a taquería serving up some of the city's finest al pastor tacos.

The splendor of this 17th century golden chapel has led it to be called the "eighth wonder of the world."

This crumbling Art Deco movie palace in Mexico City has been abandoned for two decades.

These haunting ruins of a 700-year-old Prehispanic city have witnessed centuries of wars and massacres.

A museum in the former home of Marxist revolutionary Leon Trotsky.

A 500-year-old series of tunnels long believed to be folkloric was uncovered beneath the streets of Puebla.

Clap your hands at the base of the pyramid, and the song of a sacred Mayan bird will echo through the air.

Where layer cakes tower above one’s head and there is never a shortage of icing.

A disquieting Aztec sculpture displays hundreds of stone skulls representing the victims of human sacrifice.