Bacteria and algae give the salty water its bubblegum hue.

Bask in the 19th century grandeur of an eccentric Freemason millionaire's private gardens.

Barcelona's historic 19th-century sewers, whose foundations were laid in medieval times, are open to the public for exploring.

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

The oldest restaurant in the world is this old-world Spanish eatery, still known for its suckling pig.

Hundreds of stone stairs and a winding medieval bridge connect this haunting Spanish island to the mainland.

Step inside the first house designed by Catalan architect Antoni Gaudí, considered to be one of the first Art Nouveau buildings.

Mountain where Jesus was first tempted by the Devil.

Gaze upon chocolate sculptures depicting everything from chariot races to Gaudí's famous church at this shrine to sweets.

These secluded and abandoned anti-aircraft defenses have become one the most scenic viewpoints in Barcelona.

A beautiful but toxic fountain of mercury.

This cemetery features modernist statues as strange as its name.

Three bridges and one giant canyon make up this fantastic Spanish settlement.

This semi-secret storybook hedge maze is also the oldest garden in the city.

This space-age looking obelisk rises over a city in the rainforest, meant to resemble the local castaña tree.

In this mine all the gold you can carry may not be as sweet of a deal as it sounds.

This bullring in Lima is the oldest in the Americas and the second-oldest in the world.

A Christian monastery stands on what was once a holy Incan temple.

This is why we can't have nice things on the Incan Trail.

An Inca spa, military outpost or maybe… both?

Pre-Incan aqueduct amidst a stone forest in Peru.

A kitschy Italian medieval-style castle incongruously located amidst one of the most historic towns in the Peruvian Amazon.

A paradisical gorge with rapids, waterfalls, and wildlife whose raw beauty is the stuff of CGI movies.

After an epic flood washed away its enslavers, this city has been part ghost town, part cultural wildcard for the past three centuries.