This symbolic piece of New Orleans architecture is also home to a few ghastly stories.

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

Hundreds of glow-in-the-dark objects light up a museum in a historic zinc mine.

House of vintage taxidermy and Steampunk sculptures in a quiet Pittsburgh neighborhood.

The restaurant keeps a hidden séance room on the second floor and reserves a table for the spirit of the former owner each night.

A historic neighborhood church is reborn as a psychedelic arts collective.

This semi-secret garden in south Seattle emulates a traditional Japanese garden using the plants of the Pacific Northwest.

A Bibliophile's Dream.

Strange red rock formations that have been attributed to a higher power for hundreds of years.

A hidden network of subterranean passageways lies tangled beneath Indianapolis' bustling City Market.

One of the dwarven trees dates back to 1625 and survived the Hiroshima bombing.

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

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

The world's longest known cave system.

This incredible collection of vintage pinball machines can be played at 25 cents a pop.

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

A self-built castle made by a mysterious man.

A beautiful geyser under environmental threat.

This unique structure in suburban Austin is made up entirely of other people's castaways, and constantly changing.

Olfactory delights in San Francisco's Botanical Gardens.

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

With over 100 jam-packed rooms to explore plus elaborate tea services and events, the Mansion on O Street is a hidden treasure.

A hip bar decorated with walls of golden skulls.

A museum befitting the city responsible for supplying the majority of the world's LSD.