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

A monument to a survivor of harsh pioneer life, frostbite, and primitive surgery.

An apocalyptic seismic event creates a deadly chain reaction that ends with a 6-mile long lake developing within weeks.

A man-made island in scenic San Francisco Bay.

An amazing collection of fantastic reptiles, amphibians, spiders, and insects.

The century-old bell and clock tower at UC Berkeley is the third-tallest in the world, and has fossils.

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

A beautiful geyser under environmental threat.

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

The first declared National Monument in the United States.

The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

A popular rock that acted as a waymarker for American pioneers.

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

Site of the 1879 Cheyenne Outbreak and the site where famed Sioux chief Crazy Horse met his fate.

An experimental, automotive replica of Stonehenge.

A century-old cabin off of Highway 30 touts an unusual construction material: dinosaur bones.

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

This erect, phallic geological spire wasn't always named so domestically.

The Denver airport is guarded by a 32-foot-tall sculpture of a demonic horse.

Inspired by a music box, a small town Vietnam vet carved an entire carousel full of animals by hand.

Long before guestbooks and hotels, frontier travelers signed their names on this rock face.

Paranormal experiences in this hotel's room 217 led Stephen King to write "The Shining."