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

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 oldest and most massive living organisms is a grove of quaking aspens.

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.

The abandoned coal loading dock is a canvas for unsanctioned art.

This elaborate towering structure was once famed for its revolutionary height.

Yo, Adrian!

A mine fire has been burning under the deserted town since 1962, but this church is still going strong.

A toxic ghost town sitting atop a massive coal fire.

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

A vertically floating hemlock controls the waves and weather at Crater Lake.

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

A Nessie-like monster supposedly lurks in this lake.

A pedestrian island in the middle of world-famous Times Square emits a strange (and purposeful) humming noise.

A semi-scholarly approach to sex.

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

The longest living non-clonal organisms on Earth.

Modeled after a famous church in Vienna, Austria—but in Helena, Montana.

The old fire tower is one of the last of its kind in the United States.

The only road through the heart of Glacier National Park.

The eccentric mansion of one the most popular horror authors of modern times.

This "second" cemetery represents New Orleans' attempt to keep cholera at bay.

A museum and shop on Bourbon Street located in the former home of the second Voodoo Queen of New Orleans.