An overlooked and unassuming engineering marvel.

Golden Gate Park's historic collection of plants.

San Francisco's urban bison herd has persisted in the face of extinction, development, and disease.

The one-time watch house for incoming ships at the Golden Gate now stands abandoned and hidden in trees.

Rodin's famous depiction of Dante's 'Inferno', amidst a sculpture garden of many of his other works.

The neon signs from Las Vegas' past find their final resting place at this unusual graveyard.

Lucha Libre (Mexican Wrestling) themed taco shop.

An immersive art experience built by local arts collaborative, Factory Obscura, in the building formerly known as The Womb, a psychedelic arts center founded by the frontman of the Flaming Lips.

An old spiral fire escape dangles above a public courtyard in Midtown Oklahoma City.

Travel through the hidden underbelly of the city in colorful tunnels filled with art and history exhibits.

Dramatic river bend surrounds a natural red-rocked pedestal.

Most-visited and most-photographed slot canyon in the American Southwest.

Ancient pueblos built into the base of a natural canyon wall.

A spiritual vortex among the red rocks in Sedona.

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

Teeming with illegal goods and services, this towering maze of vice is also a popular tourist accommodation.

Modest by day, illuminated majestically at sunset.

"Holy Wisdom" overlooks the city that became its namesake.

Sofia's legislative center is continuously reinventing itself.

A Bulgarian monument to Russia's role in World War II is constantly being painted in pop culture protest.

A striking symbol of the Bulgarian capital.

The giant pair of sexy legs sticking out the window of this costume store have become its main draw.

This expansive bridge in the Canadian wilderness was originally just built for friends.

Surprisingly Delicious Asian-Style Hot Dogs.