Niagara Falls holds a special place in Nikola Tesla's history, so they put a statue on it.

A magical sinkhole on the Yucatán Peninsula is adorned with mini waterfalls and hanging vines.

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.

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

These azure waters were thought to lead to the Mayan Underworld.

This popular cave pool is truly magical, despite the crowds.

The hallucinogenic center of the ancient world.

A Bronze age settlement on the Greek island of Santorini might have been the inspiration for Plato's Atlantis.

This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.

Heralded as the world's first theater, these ruins are often overlooked as they reside in the shadows of the Acropolis.

Traveling this mountain pass reveals quaint stone buildings, stunning Irish scenery, and a bridge said to grant wishes.

This European portal tomb has a capstone that weighs around 150 tons.

This ancient Irish tower could easily have stood in for Rapunzel's prison.

Built in 1547, these ruins lie on a rocky promontory in Ballintoy jutting into the wild ocean waters below.

This short bridge is the only thing connecting a tiny Irish island to the mainland.

Northern Ireland's Brobdingnagian stepping stones.

This tiny train shuttles passengers to one of Northern Ireland's most spectacular sights.

The ruins of this medieval castle in Northern Ireland have inspired artists from C.S. Lewis to Led Zeppelin.

The ruins of a medieval monastery named after a type of tree.

The ruins of a sixth-century monastery sit on the banks of the River Shannon.

A rocky Irish outcropping with a history of wealth, conflict, and ruin.

See some of the world's greatest racing horses at this idyllic thoroughbred breeding facility and garden complex.

The ancient tomb acts as a calendar that keeps perfect time.