This 13th-century monastery chiseled into the side of a mountain is equipped with a bridge that can be lifted to protect against raids.

Believed to be the only Orthodox church in the world that features a free-standing pulpit.

Monasteries on rock pillars, once accessible only by frayed ropes.

A quirky bookstore hidden beneath a sea of whitewashed Greek villas.

This black sand beach was crafted from volcanic explosions including the historic Minoan eruption.

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

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

A Roman spa buried deep beneath the City of London.

A replica of the steam engine that hauled Queen Victoria's Royal Train is on display at Windsor.

At just 51 feet and 10 inches long, it's the shortest street in England.

Famously misunderstood wonder of the ancient world

After nearly 60 years, there's still a bear at Paddington Station looking for help.

The man who created the first Japanese-English Dictionary.

Remnants of an old bank adorn this station's brick wall.

This historical theme park celebrates all things noodle.

Passengers are not allowed to set foot outside this station, but you can still enjoy spectacular views of the sea from the platform.

This massive, beautifully-lit underground quarry leaves visitors in awe.

At a Japanese train station, a goddess emerges from a dumpling.

This Metabolist, retro-futuristic residential complex resembles a cyberpunk space colony established on Earth.

Watch out for the two-story Godzilla made out of tires.