Every equinox this Maya pyramid puts on a spooky ancient light show.

No telescopes, no power, no gift shop: The Observatory of Chichen Itza, one of the world's oldest observatories, takes astronomy back to basics.

Clap your hands at the base of the pyramid, and the song of a sacred Mayan bird will echo through the air.

Inside this mountain lies several kilometers of breathtaking caves.

The water in this preserved area spawns vegetation that gives it a deep green color.

The largest body of water in Massachusetts annihilated four small towns just to slake Boston's thirst.

Monument on the spot where in 1778, Bathsheba Spooner had her husband Joshua killed and dumped down his own well.

A harrowing trail up a mile-high mountain.

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

The once highest point in China blends symbolic design with a kick of adrenaline.

This working replica of the 'Friends' coffee shop is more accurate to the show than the set itself.

A bisected journey through evolution's history in the heart of Beijing.

The most famous location in China was home to whole dynasties worth of imperial rulers.

A grotesque Fiji merman dwells within this traditional Dutch-style building.

A statue of the English poet for whom this Delaware town is named is ritually dressed in seasonally appropriate clothing.

Cryptid lake monster honored with its own monument.

This 38-drawer structure claims the superlative title, but it isn't the world's only giant filing cabinet.

Who is this marble man, perpetually creeping up the steps of his own mausoleum?

Mysterious stone tower featured in many alternative histories of the New World.

Three and a half miles of cliffs, rocky beaches, Gilded Age mansions and 40 Steps to nowhere in particular.

It's not a typo, now say it five times fast!

The American Revolution was galvanized into serious action due to the tragic clash with British soldiers that occurred at this location.

This nearly endless university hallway is home to a unique sunset known as "MIThenge."

This railroad tunnel was once the longest in Massachusetts.