The beautiful tunnel that ran from the lobby to Penn Station is still hidden underneath 34th Street.

Human skulls and a stuffed goat made into a rocking chair can be found at this strange little store.

Highly spherical boulders on the shores of New Zealand.

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.

An apocalyptic seismic event creates a deadly chain reaction that ends with a 6-mile long lake developing within weeks.

Rippling sand dunes frozen in the Arizona rock.

The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

A beautiful geyser under environmental threat.

An architect's childhood fantasy treehouse made real.

Dramatic river bend surrounds a natural red-rocked pedestal.

The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

A clear blue swimming hole with hidden caves, still unexplored.

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

Here, at the "world's longest art gallery," you'll find forty miles of ancient petroglyphs and pictographs.

These Pre-Columbian petroglyphs contain representations of birds, deer, hunters, and even some early Native flute players.

Seemingly grown on some other world, these New Mexico rock formations look like a disused science fiction set.

An immersive environment that is part haunted house, part choose-your-own-adventure, and part jungle gym.

A futuristic temple of light uses prisms and rainbows to create an atmosphere of peace.

Legends surround this jagged rock formation in the New Mexico desert.

A small metropolis of Pueblo cave dwellings have been carved right into the hillside of this national monument.

A unique geological area spiked with wind-carved rocks that resemble teepees.

This museum started as a collection of Manhattan Projects and continues to add exhibits as they are declassified.

Seller of surplus nuclear research materials.

This popular pilgrimage site offers a hole filled with holy healing dirt.