Running since 1864, this clock has yet to be wound, one of the longest-running science experiments known.

One of the world's largest pianos is displayed in the workshop of the man who built it as a teenager.

Known for the tunnel that leads visitors to the water.

The "Rocky Horror Picture Show" character has a hidden camera that broadcasts people doing the "Time Warp."

These two delightful animal-shaped buildings host a visitor center and wool shop.

One man's dream has turned into this naturally growing chapel made of almost nothing but trees.

A tribute to Richard Feynman is carved into the land he planned to see but never got to visit.

A statue of traditional Kazakh dancers adds some beauty to this Soviet-era mining city.

Antarctica's only sculpture garden, it has art and penguins, but no plants in sight.

An abandoned stretch of elevated road in the middle of the Brazilian jungle.

This 14th century castle withstood years of battle but is now sliding off the hills into the Danube.

The place of worship erected not once, but three times in one of the most desolate places on Earth.

Antarctica's bustling metropolis, originally established by Richard E. Byrd.

The remains of a doomed Antarctic plane, buried beneath layers of ice and snow, await those willing to do a bit of digging.

A wooden hut from the Heroic Age of Antarctic Exploration.

This repurposed church offers a more literal way to get closer to the heavens.

This solitary monastery may hold the remains of Vlad the Impaler (but probably not).

One of the world's most advanced radio observatories sprawls across the Atacama Desert.

These passages carved from the Antarctic ice hold strange shrines to the harsh southernmost climes.

The world's largest neutrino telescope searches for secrets of the universe at the South Pole.

During World War II the Thorp building was guarded by the OSS, FBI, and US Navy because of the top-secret bombsight being produced there.

Several of these strange cone-shaped bunkers can still be seen around the former Nazi headquarters.

An old department store turned Nazi prison turned artist commune.

One of the largest pieces of scientific equipment ever carried on a NASA space shuttle sits in a Chicago alley.