One of the most extensive and well-preserved collections of dinosaur footprints in North America.

The biggest solar telescope in the world helps reveal the secrets of our sun.

This Arizona observatory is famous for investigations into Martian life, and as the place humans first spotted Pluto.

This golf ball–shaped former desert real estate office now houses a UFO museum.

On the outskirts of a reborn ghost town, a decaying post office remembers the bad old days.

Witnessing the might of this dessert-colored desert waterfall is a rare, powerful treat.

A reproduction of earth's many biomes.

Eons ago, a rushing lava river formed this pristine passage through solid rock.

See massive fossils that are over 200 million years old in northeastern Arizona.

In a 345-million-year-old cave that's 200 feet underground, dinner awaits.

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

Dramatic river bend surrounds a natural red-rocked pedestal.

Rippling sand dunes frozen in the Arizona rock.

The installation’s official name, “You Who Are Getting Obliterated in the Dancing Swarm of Fireflies,” says it all.

Most-visited and most-photographed slot canyon in the American Southwest.

The macabre collection of Jacques Sirgent, an expert scholar on the undead and all of their trappings.

The largest permanent Monopoly board makes one of the longest games even bigger.

The giant pair of sexy legs sticking out the window of this costume store have become its main draw.

San Francisco's urban bison herd has persisted in the face of extinction, development, and disease.

A 300-ship graveyard, with a few still visible at low tide.

Visible below the waves are memorials to the city's Gold Rush dead.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

The tea room that pushed the boundaries of adorable straight into...we can't find the words.

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