The key to turning shifting dunes into the green oasis of Golden Gate Park.

A monumental cross hides in the trees in Golden Gate Park.

Allowing humans and fish alike to migrate from freshwater to saltwater and back again.

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.

This rugged area of red rocks and arches is often considered one of the most beautiful places on Earth.

Giant, natural amphitheaters made of delicate geological formations called "hoodoos."

One of the world’s largest collections of petroglyphs records 2,000 years of human activity.

Few things look more out of place than the electric blue ponds in the reddish-brown desert of Utah.

This raised bulls-eye visible from space was the subject of an intense geologic controversy.

Bizarre lunar-like landscape with thousands of large stone "hoodoos."

One man has installed bathtubs into the Utah desert floor to harness the powers of a natural hot spring.

The notorious Wild West outlaw was raised in this unassuming abode.

Come for the speed, leave in love with the desert.

A 90-foot-tall psychedelic "tree" on the side of the highway has baffled passersby for decades.

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

Aqueducts have dramatically changed this old lake, now home to tufa towers and its very own species of tiny brine shrimp.

A charming desert roadside bakery that produces 10 times more bread daily than it has residents in its town.

Millions of years of oxidation make a drive down this winding Death Valley road surprisingly colorful.

The lowest point in North America is home to an undrinkable pool surrounded by fields of geometric salt flats.

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

Within the former ghost town of Cisco is a carefully restored tiny town with one resident and its own art residency.

This spectacular track has run continuously since 1882.

The marker offers a rare chance to be in four U.S. states at once, though there's some controversy over its geographic accuracy.

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.