The haunting, dilapidated remains of a former poorhouse on Staten Island's Greenbelt.

An outdoor sculpture park of giant pink robots and post-apocalyptic Christmas scenes.

Brightly colored 30-foot-tall totems light up the desert sky just outside Las Vegas.

Quite simply the largest tree in the world (by volume).

A popular swimming hole that hides one of America's most deadly diving spots.

This geothermal hot spring hides beneath a slowly growing mineral dome.

A beautiful 62-acre Catholic shrine and botanical garden.

One of the most scenic stretches of road in America winds between some of the country's oldest trees.

Rustic natural hot springs in the deciduous rain forest.

The ghost town that ended up on Ebay.

This charmingly homemade amusement park has been growing for 40 years.

Canyon walls shrouded in ferns.

A celebration of capitalism in Midtown.

Oregon's unexpected high desert, displaying layers of time in a colorful show.

A museum dedicated to the history and exploration of both popular music and science fiction.

This abandoned Navy base was transformed into an off-grid alternative living community for thousands of people.

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

A reproduction of earth's many biomes.

A modernist landscape of water and sci-fi concrete.

Breathtakingly blue walls shimmer inside the "Glacier Behind the Town."

Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

The world's longest known cave system.

A religious-themed park filled with folk art to bring biblical stories to life that fell into disrepair and now being restored.

A beautiful Victorian-era cemetery, complete with a miniature village.