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

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

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

A sacred site for Native Americans surveyed by George Washington and owned by both King George III and Thomas Jefferson.

Welcome to old Florida, where a 1940s mermaid show is still enchanting visitors.

The magic's in the hole!

This grand gothic brewery has been pumping out suds for over a hundred years.

The world's longest known cave system.

The oldest surviving bridge in New York City, which reopened to pedestrians in 2015.

These delicate buggers are some of the rarest fossils that have bubbled up from the Tar Pits.

Each year these high desert hills are absolutely covered with poppy flowers in a surreal show of nature.

This historic "City of the Dead" lies prominently in the center of New Orleans' famous Garden District.

This upscale streetwear store is hidden behind a fake Snapple machine in the back of a deli.

This knobby, drooping New Orleans oak is a favorite place both for climbing and for meeting giraffes.

The seawater playground of gilded-era San Francisco burned to the ground in 1966.

This modern antique shop is a museum for 1980's Saturday morning cartoon culture.

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

Long-abandoned trolley tunnels just a mile away from the White House are turning into an art space.

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

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

This abandoned amusement park was built on a site with a dark history.

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

New York City's smallest piece of private property.

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