A well-worn marker in a forgotten alleyway is all that remains of what had been one of Manhattan's most beautiful buildings.

Once the tallest building in the world and the site of “the highest dinner ever held in New York” this building now holds the most expensive penthouse in the city.

An uber-secure, windowless tower of doom in the center of Manhattan is an NSA spyscraper.

The railroad turning train travel into a cinematic, highly immersive experience has a fascinating connection to Game of Thrones.

Wedding chapel's mysterious spiral staircase said to be miraculously constructed.

Life-sized sculpture of a blue whale made of hand-recycled plastic trash.

Giant origami sculptures tucked into desert scenery beckon passers-by to explore further.

A historic cemetery with unique artwork, a Civil War fort, and also happens to be the site of the Battle of Bladensburg.

An overlooked oasis of quiet on the grounds of Washington's monumental basilica.

The potters' quarter is packed with artists sculpting clay gods with mud from the sacred Ganges river.

An eclectic mix of influences rot together in harmony in this India necropolis.

This Jewish bakery, among the last in the region, sells legendary sweets from a century-old storefront.

The world's largest secondhand book market is a haven for bibliophiles and bargain hunters.

This vast masterpiece of Moroccan architecture spreads across 20 acres.

Fortune tellers, snake charmers, poets, and storytellers all gather on this historic square in Morocco.

It took 40 years to build this Eden-like garden in Marrakech, later restored by Yves Saint-Laurent.

The oldest monument in Marrakesh and the city's only surviving example of Almoravid architecture.

Deliberately hidden for centuries, the magnificent Saadian Tombs were eventually uncovered in 1917.

Morocco's largest Jewish cemetery.

This graveyard is the eternal home of the residents of a vanished California town.

A non-native grove of 241 redwoods in Southern California.

A reproduction of earth's many biomes.

See massive fossils that are over 200 million years old in northeastern Arizona.

Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.