19th century tunnels burrowed under Liverpool.

This abandoned Greek island was the last active leper colony in Europe.

The abandoned summer estate of the former Greek Royal Family.

This "volcanic all-day restaurant" is right on the beach.

A small island with shimmering pink sands, home to loggerhead turtles and rare plants.

The oldest olive tree in Greece has been bearing fruit for at least 2,000 years.

Cretean quarry suggests real-life site for ancient Greek myth of the man-eating Minotaur in his labyrinth.

According to myth, Zeus himself was hidden in this cave to escape being eaten by his dad.

This little Greek plateau is home to thousands of rustic, white-sailed windmills.

These caves secretly held national treasures during World War II.

The oldest cemetery of modern-day Athens blends the modern and ancient worlds.

The Cycladic architecture makes this Athens neighborhood feel like an island paradise hidden in the shadow of the Acropolis.

The railway carts travelers to central Athens's highest peak, which offers stunning vistas of the city.

Gladiators once walked this ancient, subterranean passage.

By night, this auto repair shop turns into a taquería serving up some of the city's finest al pastor tacos.

Visiting this cacophonous collection of vintage novelties is like stepping into the mind of a crazed toymaker.

A quirky and charming restaurant founded by artists.

Superstitious? Discover the witchy side of Mexico through its largest esoteric market.

This warehouse-gallery-shop hybrid showcases Mexican craftwork at its best.

This once-abandoned mansion is now a dreamy event space.

The striking jade death mask of an ancient Maya king is displayed in a replica tomb in Mexico City.

This ancient jade mask depicting the Zapotec bat god was found in the ruins of the pyramids of Monte Alban.

This colossal ancient sculpture of the monstrous Aztec rain god has a literally stormy history.

Beneath the most controversial monument in Mexico City is a cultural center that exhibits only digital art.