Though his role as the inventor of baseball may be up for debate, fans still festoon Doubleday's grave with baseballs.

A gift from Scotland to the United States in memory of the 270 lives lost when Pan Am Flight 103 exploded over Lockerbie due to a terrorist bombing.

Once a dining hall for boarding school students, this lodge was a popular haunt for nuclear physicists working on the Manhattan Project.

An unconventional monument to one of America's largest landowners.

This vintage theme park is peak Christmas kitsch—and it's open all summer.

In the middle of a busy airport, a statue honoring the astronaut who told Houston that Apollo 13 had a problem.

A pair of gargoyles peer into unsuspecting passengers at Denver’s conspiracy-packed airport.

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

A focal point of in Denver’s skyline for over a century, inspired by a Venetian basilica.

These murals from the 1920s beautifully depict America’s industrial age.

This sidewalk tribute honors Colorado's great culinary creation.

Overlooking the Colorado Convention Center is this giant sculpture made from thousands of triangles.

A multiversal transit station located right below a highway interchange.

A whimsical monument marks the highest point in Kansas, not that you could tell by the looks of it.

The hallowed ground of one of the worst atrocities in United States history.

Once a lonely sentinel on the edge of the Great Plains, this rebuilt trading fort offers a glimpse of life on the Santa Fe Trail.

Once named the “world’s oldest gas station” due to its unusual construction material.

The remains of a World War II-era Japanese American internment camp dot a windswept Colorado hill.

The first graveyard named "Boot Hill" was established in Hays, Kansas, years before better known cemeteries with the same name.

A museum documents the development of the invention that tamed the Wild West.

These otherworldly limestone formations jut out from the Kansas prairie.

Massive still life just off the highway in Kansas.

This 29-ton granite ball spins around at the slightest touch thanks to a scientific phenomenon.

A memorial for the mustachioed record-setting runner.