This abandoned fighter jet launch center is now a haunting street racing course.

With a facade that measures just 107 centimeters, this five-story building is one of the skinniest in Europe.

This amazing example of Valencian Art Nouveau looks more like a cathedral than a public market.

Once the local rulers had gone these enchanting ruins housed common folk in an almost real life fairy tale.

A maze of crosses marks the jumbled divide between the Netherlands and Belgium.

This beautifully designed star-shaped fort was the premier defense system of the late 1500s.

Once the tallest building in the world, this abandoned church is now a monument to the destruction of WWII.

The most visited pilgrimage site in Armenia once held a saint in a pit for 13 years.

Foreign invaders almost left this lovely Caucasus palace alone—almost.

The village's cobblestone streets are lined with shops displaying exquisite copper craftsmanship.

A massive collection of petroglyphs dating back some 40,000 years.

The building's fluid, wavelike walls are a true feat of architectural ingenuity.

This colorful artistic feature atop a Danish art gallery allows visitors to stroll through a rainbow.

Denmark’s never-ending bridge.

Preserved "bog person" that is over 2,000 years old.

Mounds, rune stones, and a 1,000-year-old church, left behind by Denmark's first two kings.

This unique architectural wonder is home to luxury apartments.

A perfectly circular stronghold constructed in the 10th century is now a nucleus of Viking culture housing a museum, village, and reenactment of an epic Viking battle.

A spiralling hourglass-shaped tower rises from the forests in Denmark.

The de facto symbol of Copenhagen is this bronze fairytale which cannot seem to keep its head for very long.

Copenhagen's celebrated theme park and gardens.

A decommissioned submarine base makes a great space for graffiti art.

The widest natural waterfall in Estonia is a sight to see in all seasons.

Relics from an era long gone, sit idle outside this Estonian museum.