Giant telescope mirrors built in a spinning furnace under a college football stadium.

Yale University's home for rare works, including the mysterious Voynich Manuscript.

Will Geer's outdoor theater started as a mountain retreat for actors, musicians, and other artists who were blacklisted during the Red Scare.

An architect's childhood fantasy treehouse made real.

A collection of memorabilia from the Beat era in the back of a San Francisco bookstore.

One man's quest for the ultimate road trip vehicle.

A computer bug so primitive it was an actual insect.

An underground mansion with fruit-bearing trees and grapes growing beneath the surface of central California.

Explore 10 acres of environmental sculptures.

Numberless clock creates a meal of time for the dreaded, insectile Chronophage.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

A faithful reproduction of Al-Jazari's enormous water clock.

Finale of "William Tell Overture" can be heard as drivers pass over grooves in the road.

The massive machine creates cracking displays of indoor lightning.

Less a museum than a bizarre fantasy world created by artists and engineers.

This everlasting lightning storm may be the world's largest generator of ozone.

A 19th-century subterranean reservoir repurposed as a contemporary art cave.

Behind this beachfront shop lies a spectacular, colorful sea cave with an equally colorful past.

A bizarre house filled with an astounding array of collections.