This harsh mountain path was built as a strange attempt to improve the health of Turkmen citizens.

A dictator's failed public works project has been reborn as two linked trails through spectacular scenery.

Dramatic river bend surrounds a natural red-rocked pedestal.

A tunnel with windows, so you don't miss out on the impressive views.

The marker offers a rare chance to be in four U.S. states at once, though there's some controversy over its geographic accuracy.

Bizarre lunar-like landscape with thousands of large stone "hoodoos."

The hike through a narrow river flanked by the 2,000-foot-tall walls of Zion Canyon is one of the best in the world.

A grove of "candelabra redwoods" deep in California's Lost Coast.

A mountain range on an active U.S. Navy base hides thousands of mysterious prehistoric rock carvings.

This dry lake bed contains the oldest known petroglyphs in North America.

A replica of the Liberty Bell rang daily from West Berlin's City Hall throughout the Cold War.

This temple to the sturm and drang of Richard Wagner contains a dragon's cave and reptile zoo full of living "dragons."

The site of a concentration camp where inmates were made to take part in one of the largest counterfeiting operations in history is now hauntingly empty.

Though it may look like it’s missing its outer shell, this skeletal cast-iron tower was built to withstand wind and waves.

Berlin's natural history museum houses the world's largest mounted dinosaur and the late beloved polar bear Knut.

A surreal museum of extraordinary industrial objects.

Started as a kitchen garden, now the second largest botanical garden in the world.

A slice of central Asia in the middle of Berlin.

This beautiful 19th-century temple stands atop the ruins of its predecessor.

A serious museum dedicated to two German comedians.

The telescope that discovered Neptune.

One man's personal kunstkammer, museum and shop.

An abandoned stretch of highway, deteriorating next to the operational one.

The body of one of the world's most famous outlaws is covered in cement and iron to prevent it from being stolen.