A massive work of modern art that appears to be a crop circle in the middle of the desert.

This red lake 4,000 meters above sea level is home to rare flamingos.

Elevated freight railway turned wildly successful urban park.

Popular tourist destination where witches in dark hats sell dried llama fetuses for good luck.

The oldest public library in Ireland.

Roughly 17 million letters to Santa have found their way to this Arctic Circle post office.

Every half hour the eye-rolling clock face sticks out its tongue to mock the good citizens of Koblenz.

105-foot wide giant metallic flower blooms anew every day in the heart of Buenos Aires.

Huge stone depressions which may have acted as an Incan agricultural experiment.

Mountain of unimaginable riches that bankrolled the Spanish Empire, complete with its own underworld god.

An unexpected desert oasis in South America.

The Uros people live on floating reed islands in lake Titicaca.

Preserved Inca city and site of the last Inca stronghold against the Spanish conquistadors.

These steeply terraced ruins are a stop along the Inca Trail to Machu Picchu.

The mysterious "Candelabra of the Andes" could represent anything from a god's trident to a hallucinogenic plant.

Former hunting lodge of a duke who was an avid collector of impressionist works.

A horde of stray cats rule in this secluded Parisian cemetery under a bridge.

France's most famous cemetery, with some of its most curious tombs.

The water-powered carriages are long gone, but for over a century this funicular railway has been the fastest route to the highest point in Paris.

Paris' linguistic guide to the international language of, yes, love.

The first green space constructed on an elevated viaduct.

The old observatory in Copenhagen has a spiral corridor used as a racetrack.

A hugely vast Irish landscape of barren rock that stretches for miles.

This modest plaza in Moneygall, Ireland has cashed in on its distant connection to the U.S. president.