God's Saharan sandbox of wrath.

The largest madrasa in Morocco once housed more than 900 students within its exquisite walls.

The ruins of the first Spanish settlement in Puerto Rico.

A museum collection honoring the long history of the FDNY is held in a disused Manhattan fire house.

A hidden architectural treasure in New York's Brooklyn.

An unrealized dream to wirelessly electrify the entire Earth.

The site of a tragic massacre that spawned a multimedia franchise.

A hidden "place of interment for gentlemen."

A clock set into the concrete outside a Manhattan jeweler has been telling time underfoot for over a century.

The fanciest public restroom in New York City boasts fresh flowers, art, and a classical music soundtrack.

Blighted Irish field and the ruins of a 19th-century cottage on the edge of urban Manhattan.

The last slot car racing arcade in Brooklyn is keeping the dream of speedy little autos alive.

This cairn marks the only place where Central European Time, Eastern European Time, and Further-eastern European Time meet.

Villas that once served as playgrounds for the rich now fall away in decay.

Mysterious heaps of stones dot these otherworldly woods.