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

A stunning, two-tiered waterfall made famous by poets, artists and the legend of a ghost dog.

One of only two commuter aerial tramways in the United States.

Take a drunken tour inside the world's largest known geode.

A breathtaking array of ancient Pueblo structures and artifacts counterintuitively preserved by neglect.

A "gravitational anomaly" located in the redwood forests just outside of Santa Cruz, California.

An underwater city for the dead.

This frequently-photographed waterfall takes only a short hike to visit.

A castle that was built stone by stone by an eccentric journalist.

A DIY art gallery/music venue/lecture hall dedicated to video game culture.

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

A pair of slides and a tree-lined stair corridor have been an urban oasis for nearly 40 years.

A strange house built only at night, with rumored mystic inspiration.

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.

Possibly the most beautiful carillon in the world, set atop Iron Mountain in Florida.

A beautiful geyser under environmental threat.

Towering basalt columns, a creation of fire and ice.

A hip bar decorated with walls of golden skulls.

Tour the dark and beloved poet's former cobwebbed basement, which may have inspired "The Black Cat."

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

The first declared National Monument in the United States.

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

The remains of a failed attempt at medieval nerdery are hidden deep in the woods of Virginia.

A beautiful 62-acre Catholic shrine and botanical garden.