A small but stubborn relic of Spain’s turbulent past hides in plain sight.

The ruins in this village were caused by something more sinister than neglect.

A 3,000 acre historic oasis and farm in the middle of the UAE's "Green City".

Feed it cash, get your very own gold bar.

On any given day this sprawling market houses literally tons of government-regulated gold, gems, and precious metals.

Whitewashed mosque contains the world's largest carpet.

Hilltop garden on the site of an old fortress overlooking the Mediterranean Sea.

This seemingly humble work of art—a block of limestone—conceals a daring story and an artistic tour de force.

Luxembourg's most popular statue since 1923 has been missing for... 26 years!

An ancient Roman relief beautifully preserved on the façade of a house.

An expansive complex of subterranean tunnels is all that remains of one of Europe's most formidable medieval fortresses.

Climb around the high waterfalls on series of iron ladders and bridges within the wildest gorge in the Slovak Paradise.

An abandoned logging settlement nestled in the woods near a popular ski town.

The Spanish king's private bathroom embraced the idea of a porcelain throne.

Abandoned for decades, trains still pass through the now-restored remains of one of Madrid's first metro stations.

Centuries of biking history are nestled in the shadow of the birthplace of contemporary mountain biking.

A living time capsule of the 1960s Richardson Bay water-front.

A working model of the entire San Francisco Bay and much of the Sacramento River Delta, complete with regular tides that change every 14 minutes.

Concrete strongholds stand guard over the Golden Gate.

Ride on a fully-restored Nike nuclear-tipped missile elevator from the Cold War.

Internationally-recognized arts center housed in a century-old former military barracks.

Beneath the southern end of the Golden Gate Bridge is the “Gibraltar of the West Coast,” a fort built to protect the San Francisco Bay from naval attack.

A modern mechanical planetary system, part of a 10,000 year clock.

There is no trying to fall in love with this Star Wars fountain, you just do or do not.