A complex and beautiful system of rice terraces covers a million acres over the mountains.

A dreamy mausoleum honors Persia's most famous poet.

This everlasting lightning storm may be the world's largest generator of ozone.

This temple is steeped in local folklore involving a teakettle and a raccoon dog.

The most alien-looking place on Earth.

Intensely colorful calcite pools in Southern China.

Two groundbreaking brothers from Pasadena.

The tennis legend used this racket while breaking the race barrier and becoming the first Black man to win the US Open.

The romantic botanic tunnel feels like a well-kept secret.

Two rocks in a perpetual kiss and one of "the most romantic spot in America."

Medieval ruins on a tiny island amid a flooded lake offer romantic respite to lovers seeking privacy.

A lover's walk between hilltop towns, decorated with graffiti love notes.

A Mexican Romeo-and-Juliet-esque legend has given this super-narrow alleyway a reputation for romance.

This small chapel holds the mummified heart of one of the heroes of the Greek Revolution.

An obelisk marks the spot where a British explorer's heart was buried before the rest of his body was transported to England.

This statue honors a pillar of the early New Haven Black community.

The monument honors the first (and for a long time, only) African-born philosopher to teach at a German university.

A Cold War secret surveillance tower used to spy on radio communications.

Captured in 1968, the Cold War spy ship is the only U.S. Navy vessel being held by a foreign government.

An exercise in radical design and social living that became the epicenter of Soviet spy networks in London.

Cold War intelligence agents monitored communist embassies from an attic in a former pigeon coop.

A secret rendezvous spot where John S. Mosby and his Rangers would meet to divvy up their loot after raids.

A museum dedicated to secret surveillance.

Home to items never before seen by the public.