Ancient pueblos built into the base of a natural canyon wall.

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

This collection of Wild West movie memorabilia also claims to hold some secrets of the Lost Dutchman's mine.

These picturesque Hawaiian falls are home to a rare species of fish that uses a special sucker to climb up cliffs.

Hide from the tourist hordes in these relatively unknown, and unguarded lava caves.

A beach made of semi-precious green sand on the Big Island of Hawai'i.

The southernmost point in the United States is a beautiful place to look at but a deadly place to wade in.

This black shoreline is made up of exploded lava particles.

These ancient sacred grounds granted amnesty to those who managed to reach them.

A controversial memorial at the place where Captain Cook met his violent end.

Honoring the famed folktale author, this California museum looks like it belongs in the Black Forest.

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

Mining caused an asbestos emergency in this small town.

According to legend it was a nap taken under this tree that kicked off the California Gold Rush.

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

World-famous, Pink's still manages to keep its prized cult fetish status.

The final resting place of a space program monolith.

The hike through a narrow river flanked by the 2,000-foot-tall walls of Zion Canyon is one of the best in the world.

A towering tribute to decisiveness stands on the spot where Brigham Young and his followers decided that this must be the place.

Largest man-made excavation on earth!

Despite sitting firmly in the global cradle of the Church of Jesus Christ of Latter-day Saints, this Hare Krishna temple is host to one of the largest color festivals outside India.

The remains of this early 20th century refinery loom on a mountainside like a graffiti-covered fortress.

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

This concert pavilion on the shore of the Great Salt Lake has been destroyed by fire, water, and disinterest but keeps coming back.