An ancient octagonal weather station named for the eight Greek gods of wind.

A man's head is enshrined beneath a statue near the first building constructed for the modern Olympic Games.

These caves secretly held national treasures during World War II.

Legend says this sacred tree was a gift from goddess Athena.

A Byzantine church containing the holy remnants of three saints sits atop the site of an ancient temple.

A former military hospital is now used to study and preserve artifacts of the Acropolis.

A mysterious architectural gem in one of the most elegant areas of Buenos Aires.

This small museum explores Mexican history and culture through clothing.

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

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

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

Iconic red and white plaques show the creative names invented to navigate the city streets.

In the middle of this historic colonial city resides a modernist government building known as the UFO.

Half-hidden by grassy slopes, this striking Spanish colonial fort is now a museum of underwater archaeology.

A Spanish Colonial fort now houses an archeology museum.

A monument in the shape of the mighty conch honors the history and symbolism behind this shell.

An incredible collection of Mesoamerican art assembled by one of Mexico's great artists.

This amazing collection includes rare stamps from around the world, including fluorescent ones.

A 16th-century monastery boasts a lush array of plants native to Mexico’s most biodiverse region.

The stoutest tree in the world.

This Oaxacan town is known for its colorful fantastical creatures hand-carved by local artisans.

This beautifully deceptive waterfall is something far different from what it appears to be.

This trio of Australian rock spires may have inspired aboriginal legend or just modern tourism.

A massive stairway that almost wasn't leads to one of Australia's most scenic vistas.