The ruins of the bathhouse used by the ill-fated last Aztec emperor still lie in Chapultepec Park.

This strange sculpture of a menacing skull surrounded by sun rays was discovered at the foot of the Pyramid of the Sun.

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

This old-school café is famous for serving coffee, chilaquiles, and the Cuban Revolution.

Frida Kahlo's childhood home, now a museum of her life and works.

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

A jaw-dropping "megalibrary" that turns book-browsing into a geometric adventure.

The world's tallest carillon is located at the top of this skyscraper in Mexico City.

These floating gardens show what Mexico City used to look during the Aztec Empire.

This clock was gifted to Mexico as a show of gratitude for its long history of welcoming Arab migrants.

Once home to an aristocratic family and a workers' organization, this intricately tiled building now houses a chain restaurant.

A series of abstract sculptures pop up from an otherworldly volcanic landscape.

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

This one-window stand has been home to a giant vat of slowly simmering meats and an array of unique tacos for almost 50 years.

The sculpture's largest spire points directly toward the North Star.

Once the center of Gold Rush mania, now the starting point for the Yukon Quest sled dog race.

This mile marker stands at the unofficial end of a highway built to defend the United States from a Japanese invasion during World War II.

This medieval city gate is now a blend of the past and the modern world.

Every day is like Christmas on this street where the traditional Neapolitan nativity scene comes to life.

These "anatomical machines" are only one of the many strange items in this Italian crypt.

Three underground crypts and a pointed arch under the bell tower make this cathedral unique among Romanesque churches.

Southern Italy's spinning top village.

People have been living in the cave houses on this Italian hillside since the Neolithic era.

Skulls and skeletons are omnipresent in this church dedicated to souls trapped in purgatory.