Gladiators once walked this ancient, subterranean passage.

A Byzantine-era church hidden in a wooded area below the Acropolis.

These caves secretly held national treasures during World War II.

Where commuters walk through remnants of an ancient Greek necropolis.

View the ancient remains of buildings and the ancient "River of Hades" before hopping on a train.

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

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

This mystical orb covered in strange symbols is thought to have been used in ancient Greek magical rituals.

Legend says it was constructed with the destroyed pillar of an ancient Greek Temple.

This gem is often wrongly overshadowed by the larger, newer Metropolis church in Athens.

The former estate of the Guggenheims, part of the opulent Gold Coast that inspired the Great Gatsby.

A historic lighthouse steeped in rumors of ghost and pirate stories.

This 1,700-pound edible sculpture is way better than your average chocolate mousse.

A shoreline exhibit describing the disastrous first attempt by the French to colonize North America.

A small Canadian town founded as a refuge for Loyalists following American Independence.

A rare opportunity to drive across the ocean floor.

This monster fiberglass crustacean stands watch over the self-proclaimed "lobster capital of the world."

A mysterious spot where the laws of gravity seem not to apply.

Twice a day, the water of the Petitcodiac River flows upstream in a surfable wave.

These powerful, if squat, Canadian waterfalls flow in different directions depending on the time of day.

A roadside park in eastern Maine first marked the halfway point between the equator and North Pole with a brass pin in 1896.

Walk the same tracks that once ferried Gilded Age aristocrats to their vacation destinations.

The house and graveyard used in the Stephen King spine-chiller.

These light, hollow rolls have been linked to Acadia National Park since the 1890s.