Ecuador's largest Incan ruins show evidence of sophisticated irrigation and diplomacy among the ancient builders.

Largest monument in Colombia depicts 14 lancers who drove back an army.

Storied crypts fill the most famous cemetery in Colombia.

A museum built around a bus-sized fossil on the side of the highway.

This elegant Colombian fortress was one of the torture headquarters for the Spanish Inquisition.

Cathedral carved out of salt, located a mile below the earth's surface.

Unparalleled stargazing, one of Colombia's best observatories, and a swimming pool can all be found in the middle of this ancient tropical forest.

A dangling church built over a Colombian gorge.

This picturesque mansion has gone from opulent ruin to nature museum.

Commonly acknowledged as the only public monument to the Devil himself.

An ancient Egyptian temple in the middle of Madrid, Spain.

The final resting place of the poets Shelley and Keats.

The only "Egyptian" pyramid in Europe and the legendary tomb of Remus.

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

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

A surreal statue honoring Prague's favorite literary son.

A sculpture of the iconic East German car on four legs is a tribute to those who traveled to Prague seeking asylum.

The tunnel's elegant proportions keep you snug with no claustrophobia freak-out.

A bust of Franz Kafka spins in pieces, reflecting the writer's inner torment.

This automated sculpture of two men peeing will spell out text messages with their micturition.

Synagogue built from the stones of Solomon's temple contains the golem of Prague.

A mocking tribute to the past and modern leadership of Prague.

This tipsy office building in downtown Prague was originally called “Fred and Ginger.”

Despite attempts by local police to discourage it, Beatles-inspired graffiti has been a means for artists to air grievances for decades.