The unedited photograph called "Bliss" has graced the screens of over a billion computers.

Descend 2,030 years into the past in an ancient tunnel built to support Jerusalem's most famous wall.

Legend says this sacred tree was a gift from goddess Athena.

Gladiators once walked this ancient, subterranean passage.

During the Soviet era, the spire of this longstanding church was used as a radio transmission tower.

"In the Dark" Restaurant in Paris offers dinner in complete darkness.

The tradition of open-air secondhand and antiquarian bookselling in Paris dates back to the Renaissance.

Where you'll find anything but nothing.

Where you can hail your favorite fictional commanders-in-chief.

This rocky outcrop served as a quarry for some of the bluestones that sit at the center of Stonehenge.

An abandoned castle owned and ignored by Masons carries a cursed history.

This maze-like slot canyon is a unique gem within an already fascinating geological area.

A blacklight journey through a celestial art exhibit.

A Texas cave network is home to some of the world's most spectacular-looking and bizarrely named mineral formations.

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

A miniature rainforest is growing inside of a Midtown Manhattan office building.

A few dilapidated structures are all that remain of this deserted former silver mining town.

An Idaho legend carved out a cave village with his own two hands.

This set of hot springs also comes with fantastic views.

A cemetery in Barcelona's Poblenou district is home to this touching funerary statue, which depicts death in the form of a winged skeleton.

This "tower of death" has acted as an observatory, a religious hub, and an executioner's lair.

Ancient barriers wrap around what was once an important stop along the Silk Road.

Light still pours into the ruins of this ancient Islamic observatory.

The Avenue of Mausolea is a series of grand palatial tombs.