One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

The world's oldest map of the holy land gives us a fragmented glimpse of the layout of biblical nations.

This remarkably well-preserved Egyptian plinth is pretty well traveled for a giant piece of stone.

After over 100 years out of service this landmark windmill once again turns as a symbol of Jerusalem's self-sufficiency.

This life-size replica of the Statue of Liberty's flame is also a tribute to Princess Diana by default.

One of Europe's largest supercomputers is housed inside of a disused chapel.

This Hungarian castle was built out of cardboard and wood until it proved so popular that it got upgraded to stone.

A horde of stray cats rule in this secluded Parisian cemetery under a bridge.

An old slave lookout in Cuba's historic sugar cane fields.

A 250-year-old timepiece-automaton adorned with golden mechanical birds, which still sing to this day.

A fountain standing as a testament to a doomed alliance.

These tombs were built into the side of a mountain so that ancient angels could reach the dead.

Pop culture has helped to keep this iconic British building from being destroyed.

One of the largest underground systems runs under Canada's largest urban center.

This famous city eluded concrete detection until the early 2000's.

Hungarian mummies in beautiful painted coffins.

Museum dedicated to the terror regimes of Hungary.

Once the home of a hermetic monk, this cave now houses a small church.

The mummified right fist of a 1,000-year-old saint-king sits inside an ornate golden reliquary.

An out-of-place slice of France, smack in the middle of Shanghai.

A minotaur, a labyrinth, and a dubious restoration pull in visitors from around the world.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

The once highest point in China blends symbolic design with a kick of adrenaline.

Stunning Roman aqueduct used for 1900 years and still standing.