This forgotten Frank Lloyd Wright house is an architectural marvel at the end of a sleepy residential street.

First LEED-certified gas station in the United States.

The quiet canyon has a tumultuous history involving a doomsday cult.

Where the line between entertainment and aerospace blurs.

The remains of the first punk club in L.A.

A spiritual retreat in the heart of Los Angeles offers stunning gardens and a labyrinth to lose yourself in.

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

One of the world's largest automobile junkyards is a unique landscape of metal and moss.

The largest known open fault in the United States is basically a giant natural refrigerator.

The abandoned husk of a mental institution that failed to save a Jazz Age icon still sits nearly unchanged.

The second-largest (of only two in the world) large particle collider is the underdog of experimental physics.

A glittering Thai Buddhist temple in suburban Pennsylvania.

Frank Lloyd Wright built this suburban synagogue late in life, but it stands among his most iconic masterpieces.

Hellam Township is reputed to feature seven remote gates, which when passed through in the right order, open an entrance to hell.

The haunting "Hell House Altar" is one of the few remnants of an abandoned college that has been a magnet for local legends.

The resting place of a Civil War celebrity's amputated limb.

A railroad tunnel that, upon its completion, was considered one of the engineering marvels of the modern world.

The flower-shaped temple in Virginia aims to transcend the boundaries of the world’s religions.

A 120-year-old legend concerning an empty circular patch in the North Carolina woods.

An old train trestle re-imagined as an Egyptian obelisk.

This intricate Hindu temple is the largest of its kind outside of India itself and was constructed like a giant puzzle.

A mysterious monument meant to be a guide into "an Age of Reason" was destroyed after an apparent bombing.

The perfectly named cave drop is the deepest in the continental United States, almost matching the height of Seattle’s Space Needle.

This natural wonder drops 16 stories straight down through rare flora and streaming waterfalls.