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

The fifth-longest natural arch in the world, and the longest outside China.

This railroad magnate's 19th century tower is more than a little bit out of place in the Nevada desert.

These huge stone ovens in the desert fueled the Nevada silver boom, and may have also been a hideout for outlaws.

Officially named the "Loneliest Road in America," this barren stretch of Nevada road offers almost nothing but sky and open fields.

The old Route 66 town straddling Texas and New Mexico died along with the Main Street of America.

A clear blue swimming hole with hidden caves, still unexplored.

A monument to the one-armed geologist who led the first documented expeditions through the Grand Canyon.

A pair of giant roadside arrows are all that remains of a former Route 66 trading post.

The story of Two Guns, Arizona could easily be described as a Shakespearian tragedy on Route 66.

An homage to everyone's favorite prehistoric cartoon family.

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

Thousands of turbines whir at at the origin of North American wind power.

The oldest orange tree in California spawned a generation of citrus farmers.

The first U.S. town to secede from the Union, only to vote themselves right back in.

The second building of its name to occupy this location might be the finest flatiron building in San Francisco.

Concrete strongholds stand guard over the Golden Gate.

The cluster of boulders near Fort Irwin is covered in military insignia.

Celebrating the transformation of trash into objects of beauty.

An optical illusion found amid a logged redwood forest.

This massive redwood tree has a hole in the base big enough to drive through.

One of the most scenic stretches of road in America winds between some of the country's oldest trees.

A trash dump made beautiful by nature's power.

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