This Nigerian nature reserve is home to the longest canopy walkway in Africa.

An enormous pink granite batholith, long attributed with spiritual powers by the Tonkawa Indians.

Experience this Iron Age village the way that its original residents would have.

An architect transformed this abandoned cement factory into his castle-like workshop.

Native Americans built this circle of stones, which was used to predict astronomical events.

Many generations of travelers have passed through the steep, smooth walls of this canyon.

Three underground crypts and a pointed arch under the bell tower make this cathedral unique among Romanesque churches.

The second largest waterfall by volume in the U.S., Willamette Falls is outdone only by Niagara in the amount of water that is pushed northward.

A taste of Middle Earth, in the middle of the Bayou City.

This jaw-dropping 19th-century bridge uses its reflection to form what appears to be a perfect circle.

The last occupied troglodyte dwellings in England weren't abandoned until the 1960s.

An eerie, derelict amusement park in Berlin.

An unfinished complex built for children from around the world sits abandoned on the Black Sea coastline.

Mysterious standing stone formations looks like a petrified forest.

The site of many battles and tragedies, including the 40 maidens who leapt into the sea.

The oldest residential street in Europe also features an optical illusion.

This floating garden in the sky is straight out of a fairy tale, but the real thing is nothing short of magical.

This astonishingly geometric cave has inspired everyone from Jules Verne to Pink Floyd.

Renaissance villa and gardens complete with a tormented colossus.

Now an entertainment complex, the Lingotto building was once an avant-garde auto factory with a test track on the roof.

Someone loved this song enough to carve all of its lyrics onto a tree trunk in a Berlin park.

Berliners converted a bombed-out, disused lot into a community-run urban farm with its own cafe and bar.

This futuristic German spa allows visitors to float in a pool of salt water while zoning out to underwater techno.

Local legend says Isaac Newton built this footbridge without any screws, bolts, or nails.