Under a glass sidewalk lie the remains of some of Manhattan's oldest buildings.

An abandoned facility that has become a place of ritualistic satanic worship, or so rumor has it.

Four glass boxes hover over 1,000 feet in the air to give visitors an unparalleled view of Chicago.

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

The hike through a narrow river flanked by the 2,000-foot-tall walls of Zion Canyon is one of the best in the world.

Hollywood's most famous landmark, the "temporary" sign that has stood for decades longer than intended.

Mysterious rocks that ring musically when struck.

Philadelphia boasts one of the best — and most often overlooked — traditional Japanese gardens in North America.

Stroll through a wonderland of stupendous moss-covered trees.

Giant busts of 42 U.S. presidents are sitting in a field in Virginia.

The land is full of geologic eye candy, such as otherworldly spires, mushroom-shaped hoodoos, and prehistoric fossils.

A 200-year-old bar in the historic French Quarter refuses to give up its place in history, nor its role in securing ours.

A toxic ghost town sitting atop a massive coal fire.

This massive stained-glass masterpiece is thought to be the largest Tiffany dome in existence.

One man's homage to the sun continues to grow like a glass fractal.

Enormous lake at the bottom of a unique cave system.

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

A walk through the historic city center, under the streets of Seattle.

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

The world’s oldest and biggest bookstore stocking only mystery, crime fiction, espionage, and thrillers.

Under the right circumstances, this waterfall in Yosemite briefly turns a luminescent fiery orange.

Crystal clear lake with a shoreline of travertine located in a Colorado canyon.

High on a hill overlooking Los Angeles lives a world famous, high power conical Tesla Coil.

The only structure left with direct ties to the Salem witchcraft trials of 1692.