This collection of over 50 murals celebrates Brussels' rich history as the self-proclaimed home of the "comic strip."

On this Polish road, an optical illusion makes cars seem to roll uphill.

One of the largest amphitheaters in Europe is a former Nazi German gathering place that still stands today.

This sprawling concrete suburb of Kraków was designed by the Soviet Union as the model proletarian city.

Thousands of slain Soviet soldiers are buried within the shadow of this enormous obelisk.

This Slovak bridge is known both for its connection to a national uprising and its UFO-shaped eatery.

This Slovakian statue of an emerging sewer worker might just be a bronze peeping tom.

This bike path traverses the treetops.

This ancient cave temple complex is the largest and best-preserved temple complex in Sri Lanka.

This enigmatic stone pool is all that remains of an ancient palace.

Inside this former medieval prison is a collection of objects designed to inflict unbelievable pain and suffering on the human body and mind.

Climb to the top of its spiral spire for spectacular views of Copenhagen.

Europe's second largest ossuary wasn't discovered until 2001.

This sacred fig tree with a link to the Buddha is one of the oldest human-planted trees in the world.

This amazing mountain temple is topped by one of the tallest sitting Buddha statues in the world.

Seven beautiful 1,000-year-old rock-cut Buddhist statues.

This palatial, 99-doored Colonial mansion is a marvel of architectural fusion.

This former hydraulic laboratory is now a woodland dotted with old engineering models.

A suspended footbridge allows for traversing this gorge carved through the French Alps.

This strange statue depicts a young boy's body with an adult Mozart's head and a single wing.

An abandoned film set location for a remote spaceport in a galaxy far, far away hides in the Tunisian desert.

The largest and best-preserved Roman amphitheater in Africa was designed to seat 35,000 people.

The approximate spot where the last Grand Master of the Knights Templar was put to death.

A rare double mill nestled along the banks of the Aa river.