Oregon's unexpected high desert, displaying layers of time in a colorful show.

A museum dedicated to the alleged Roswell Incident.

Quite simply the largest tree in the world (by volume).

This lab's maddening silence is good for business but bad for sanity.

A Bibliophile's Dream.

Tour the sci-fi-esque reality of governmental disease management.

A whimsical village of unique treehouses resides in a Washington forest.

The scuba diving training facility was named for the steam that rises from the cave's chimney.

The private clubhouse for the members of the Academy of Magical Arts.

The inspiration for H.P. Lovecraft's horror stories and Batman's Arkham Asylum is now a condominium complex.

No one knows how this Pacific Northwest spruce tree came to have so many trunks.

Left untouched since a double murder-suicide in the 1960s, Los Feliz murder mansion remains a neighborhood mystery.

At this Denver landmark, the meals are compulsory, the sopapillas are complimentary, and the insanity is everywhere.

An acoustic anomaly with a mysterious cause.

Sniff the Titan Arum's rotting flesh.

The "Seinfeld" diner.

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

Make your reservation to have coffee with some kitties.

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

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

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

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

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

A heavenly experience, right here on Terra Firma.