Below a historic English market town lies a secret underground city complete with kitchens, laundries, storerooms, and an underground lake.

Britain's answer to the NSA is based out of this deliciously-named circular headquarters.

You can crawl inside this atmospheric 5,000-year-old tomb.

Much of what constituted mid-century Liverpool now litters a beach outside of town.

Stocking up on the world's best beer requires a pilgrimage to a monastery drive-through.

A century-old network of freight tunnels underneath the city's historic business district.

World's most expensive home.

This otherworldly palace-mausoleum complex is the stuff eternal dreams are made of.

This 19th-century pub features stained-glass windows celebrating Victorian-era "champions."

This Croatian fairytale castle is slowly falling apart thanks to years of neglect.

A museum at a Chinese university is the first of its kind in the country.

The man who is mainly remembered for a chicken dish he had nothing to do with is buried under a large concrete dome.

The burial grounds of a Chinese eunuch who served his way into the highest levels of Imperial government.

This highest bridge in the world spans such a great chasm that it had to be established using rockets.

The largest dinosaurs in the world, kissing above the highway.

Created by one of England's most prolific labyrinth designers, inspired by Bath city history.

This smaller cousin of the Forbidden City has gone from ancestral sacrifice to tourist's whispers.

Honor one of Argentina's most prolific writers at his historic home.

This glacier interpretation center houses the world’s only bar made completely from glacial ice.

This abandoned artificial island off the coast of New York City is now home to dozens of harbor seals.

Explore the atmospheric ruins of an abandoned convent in the dense forests of Mexico's first national park.

No telescopes, no power, no gift shop: The Observatory of Chichen Itza, one of the world's oldest observatories, takes astronomy back to basics.

A tea party concludes each visit to this Russian spice cookie sanctum.

Pictures tacked onto trees remember the more than 40,000 of Stalin's victims buried here in mass graves.