This gem-encrusted temple is said to contain some of the Buddha's hair which can make the deaf hear and the blind see.

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

Copenhagen's celebrated theme park and gardens.

The oldest surviving synagogue in New York City is now a soaring art space.

Roman ruins top white travertine terraces formed by ancient hot springs.

The oldest Italian café in Boston, this spot also serves as a veritable museum of vintage coffee ephemera.

On the side of a remote mountain, a stone face bearing an inscription of mysterious origin.

Remants of foundations, streets, and streetcar tracks inhabit the cliffs where a landslide occurred in 1929.

Part modern art project, part traditional chapel, this see-through church is only substantial from the right angle.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

The glowing blue Nymphaeum of Emperor Tiberius.

An ancient monastery, a locked room, and a mysterious book heist.

Walk 2,300 feet above the ground on the "Troll's Tongue."

In the middle of downtown Brooklyn lies a 165 year old secret hidden right below the surface (closed to the public indefinitely).

A massive underwater sinkhole made famous by Jacques Cousteau.

A beautiful and classically designed villa, with an hourly infestation of monsters.

Thousands of exquisitely carved stone water storage wells, hundreds of stone steps fill this exquisite medieval stepwell.

Swiss vineyards in a UNESCO heritage site.

A miniature Italianate fantasy village on the coast of Wales and the set of ITC classic "The Prisoner."

A battle between nature and architecture in the Cambodian jungle.

An ancient Egyptian temple in the middle of Madrid, Spain.

One of the largest caves in the world open to the public.

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

Abandoned city hidden from the world by tropical forest and isolation on the coast of Kenya.