A Mexican Romeo-and-Juliet-esque legend has given this super-narrow alleyway a reputation for romance.

This colonial mining complex is now home to magnificent themed gardens.

One of the oldest hospitals in the Americas is now decorated in hallucinatory murals.

No telescopes, no power, no gift shop: The Observatory of Chichen Itza, one of the world's oldest observatories, takes astronomy back to basics.

Quito's historic, main square dates back to the 16th century.

Sloth rehabilitation center in the jungle of Costa Rica.

The youngest volcano in Central America.

Debatably clever, or just plain honest hotel advertised as "The Worst Hotel in the World."

This unreal Portuguese palace looks as though it's made from a pile of different castles.

A king's pet, a pope's gift, an artist's inspiration, and a tragic shipwreck.

Germany's Glienicke Bridge has a shady history of clandestine meetings, espionage, and spycraft.

On the Spree bank, discover one of the last reminders of a symbolic wall that divided, and was torn down by the people.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

Tiny memorials honor individual victims of the Holocaust.

The fighters and conspirators that won independence for Paraguay held secret meetings at this historic house.

An out of this world experience.

This historic house museum that celebrates one of the world's most influential social reformers is also one of the most haunted locations in Chicago.

An eerie collection of the surviving structures from a past celebration of the future.

Spain's largest bullring offers a unique glimpse at architecture and history.

Its appearance in "Game of Thrones" may spur on the long-awaited restoration of this medieval shipyard.

This former charity hospital for elderly clergy houses some of Seville’s most treasured paintings.

The world's largest wooden structure.

One of Antoni Gaudí’s earliest buildings, built between 1886 and 1890 for the industrialist Eusebi Güell.

The oldest giants in Catalonia are now displayed in a 14th-century Gothic church.