Manhattan’s Battery Park has a whimsical carousel full of spinning, glowing fish.

La Monte Young and Marian Zazeela's "Dream House" will immerse you in an ever changing world of sound and light.

A room in New York City that contains 250 cubic yards of dirt worth a million dollars.

The world's oldest hologram gallery and the labyrinthine laser laboratory of a holography pioneer.

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

This structure among the trees was the result of divine inspiration.

Remnants of a storybook amusement park hidden behind a strip mall.

Relics of the 1894 Midwinter Exposition continue to delight visitors today.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

A nondescript building that's been functioning as a speakeasy for nearly a century and a half.

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