It's not hard to see why the historic Peabody Conservatory of Music's library has been described as a "cathedral of books."

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.

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

All that's left of the quintessential "cabin in the woods."

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

Bigfoot prints, Feejee mermaids, and haunted dolls on display in a tiny North Carolina town.

A huge musical sculpture and other art installations on the National Oceanic and Atmospheric Administration grounds.

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

A walk-in working camera obscura produces 360-degree live images of the San Francisco coast.

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

A hotel and restaurant serving as the mecca of kitsch.

The longest continuous lava tube in the continental U.S. offers 2.5 miles of dark explorations for the adventurous.

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

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

Two thousand artifacts from around the world collected by one woman who loved to travel.

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

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

A lush green oasis in the middle of Chicago.

A stunning, two-tiered waterfall made famous by poets, artists and the legend of a ghost dog.

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

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

A self-built castle made by a mysterious man.

A favorite haunt of dinosaur loving children and hallucinogen loving hippies alike.