Natural arch offers panoramic views of Yangshuo's karst hills.

Hidden behind musical flora and forgotten for over a thousand years, this cave is now a neon dream.

This psychedelic tourist trap is a leisurely descent into madness.

An out-of-place slice of France, smack in the middle of Shanghai.

A tidal bore with its own festival.

High on a hill overlooking Los Angeles lives a world famous, high-power conical Tesla Coil.

The world's second largest single-dish radio telescope, once used to contact E.T.

Once close to extinction, there is no shortage of elephant seals on the beaches of Año Nuevo State Park.

A hotel and restaurant serving as the mecca of kitsch.

A massive volcanic plug is now a protected area that hosts a number of bird species.

An alley covered with 20 years of bubble gum.

See massive fossils that are over 200 million years old in northeastern Arizona.

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

A reproduction of earth's many biomes.

An urban laboratory.

Some of the tallest ancient American ruins continue to inspire awe and curiosity.

A geological mystery on Camelback Mountain.

Equal parts record-breaking temple to consumerism and bizarre fun park, it's more than you think it is...

A toweringly silly piece of modern art has been delighting locals since the 1980s.

20,000 pieces in a Frank Gehry-designed building.

When flour explodes, it's not a pretty sight.

The site of Paul Revere's historic two lantern warning.

Macabre headstones carved with winged skulls, dancing skeletons, and pithy reminders of impending death.

A former waterfront market is now in the center of town due to some interesting Boston engineering.