Art Deco stylings conceal the true nature of this bridge.

The now-abandoned tunnels were built for the transcontinental railroad on the route where the first wagon train entered California.

An iconic 1960s theater with a Buckminster Fuller-style geodesic dome.

A Wild West saloon that helped define a generation of psychedelic rock.

This cave was hidden for thousands of years, storing the worldly goods of ancient Native Americans.

At the time of its completion, it was the tallest dam in the world.

This UFO landing strip was created by a charitable Wyoming city that was worried about residents of Jupiter.

The deepest lake in the United States, and once the site of epic destruction that lives on in legends.

A quirky old tree covered in tokens, cans, and bottles of wishes.

A proto micro-nation sometimes populated by artists, surrounded on all sides by a Utah most barren.

A desert settlement founded and later abandoned by Hawaiian members of the Church of Jesus Christ of Latter-day Saints in Utah's Skull Valley.

A sculpture for the sun and stars, created by Nancy Holt.

South Dakota's oldest operating brewery is housed inside a historic firehouse.

Every president in history is immortalized in bronze in downtown Rapid City.

Hidden behind Lincoln's head is a 70-foot-long chamber containing enamel plates documenting American history, sealed in a teakwood box in a titanium vault.

One of America’s oldest and spookiest hotels, thanks to the residency of ghosts, dead presidents, and Alfred Hitchcock.

An old spiral fire escape dangles above a public courtyard in Midtown Oklahoma City.

Final resting place of Geronimo, Quanah Parker, and the first atomic gun ever fired.

This 41,000-acre wetland complex is the largest marsh in the interior of the United States.

The site of the "Bone Wars" between two rival paleontologists during the dinosaur rush of the 19th century.

This 19th century jail was mainly used to incarcerate the drunk and disorderly.

This razorback ridgeline has doubled as a scenic drive since the early 1900s.

The Denver airport is guarded by a 32-foot-tall sculpture of a demonic horse.

The highest bridge in America was built for an almost unnervingly small amount of money.