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

The burial place of some of Mexico's most prominent residents is full of macabre stories and hidden masonic symbols.

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

This giant expressionist head crowns a museum devoted to a beloved Mexican leader.

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

The only castle in North America to ever house European sovereigns.

Diego Rivera's massive tiled fountain and failed infrastructure project.

The famous artist couple lived and worked here, in two different houses separated by a bridge.

A church dedicated to the Mexican skeleton saint.

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

Some 2,000 carvings show this rare desert spring has been an oasis for travelers for over a thousand years.

This once lawless patch of land was home to an infamous and deadly land feud.

This grimly-titled Texas cemetery is all that remains of a Wild West settlement with possibly the worst name.

It specializes in outsider art and artifacts of secret societies.

A 24-hour vending machine restocked daily with homemade full-sized pecan pies.

A section of the long chain that blocked enemy ships from entering Constantinople.

A catapult rock from Gotland’s 13th-century civil war is still lodged in Scandinavia's best-preserved medieval city wall.

This slowly crumbling mansion was home to one of East Africa's richest and most powerful slave traders.

Long hidden under grime, the politically radical murals of a little known Yugoslavian master are finally getting their due.

Site of the first official transatlantic wireless communications.

An ancient Viking village in North America that predates Columbus by 500 years.

This lovely, if imposing, piece of Canadian gothic is possibly the most photographed hotel in the world.

Twice a year, visitors can tour the desolate site that birthed the Atomic Age.

The oldest known European structures in Australia are the remnants of a story filled with mutiny, murder, jealousy and greed.