Once the site of speeding horses, now home to picnickers and public concerts.

A speck of nature and art in one of San Francisco’s most notorious neighborhoods.

An artsy hidden staircase leads to breathtaking views of San Francisco.

Trails through lava-carved tube-caves display sparkling bacteria and a rich history.

The world's last remaining store of its kind.

A phenomenal assembly of pueblos in New Mexico is the most complete example of ancient ruins north of the border.

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

One man has carved a number of natural New Mexico caves into psychedelic sandstone temples.

The land is full of geologic eye candy, such as otherworldly spires, mushroom-shaped hoodoos, and prehistoric fossils.

This abandoned horse racing track was an exercise in hubris from its inception.

The site of a popular piano lounge owned by a former world champion boxer is now a place to rent a truck.

An off-the-beaten path cave with an underground lake.

A small canyon with petroglyphs and a seasonal waterfall, only a short hike from the remnants of old Route 66.

For those going through a life transition, a place to leave behind a piece of your former self.

Once a year, at exactly 11:11 a.m., this monument comes to life.

The remains of this hell for leather wild west town can still be found in the Arizona desert.

A living snapshot of a different time in America is preserved and maintained by a community of volunteers.

This public square capitalized on a single Eagles reference to bring some life back to an Arizona town.

This giant steer-skull edifice refuses to die.

In Tucson a giant metal snake helps pedestrians cross a busy highway.

A working cattle ranch with remarkably well-preserved prehistoric petroglyphs and ancient ruins.

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

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

This historic national park is covered in the stunning ruins of red rock pueblos.