Once a menacing challenge for trailblazers, this trail is now the most scenic drive in Utah.

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

Bizarre lunar-like landscape with thousands of large stone "hoodoos."

This rugged area of red rocks and arches is often considered one of the most beautiful places on Earth.

One of the world's oldest and most massive living organisms is a grove of quaking aspens.

Giant, natural amphitheaters made of delicate geological formations called "hoodoos."

A dangerous narrow-gauge railroad once traced a route through this striking canyon.

A hotel with a rich Wild West history of miners and bootleggers.

The scene of one of the darkest moments in American labor history has been left essentially untouched since the tragedy.

The highest paved road in North America winds its way up Mount Blue Sky in Colorado to an altitude of 14,130 feet above sea level.

This spectacular track has run continuously since 1882.

When ecosystems collide in the arid Southwest.

Strange red rock formations that have been attributed to a higher power for hundreds of years.

The ghost town that ended up on Ebay.

A volcanic tunnel illuminated by natural skylights offers a shaded respite from the desert sun.

The lowest point in North America is home to an undrinkable pool surrounded by fields of geometric salt flats.

The unbelievably opulent home built for an infamous newspaperman.

This rare example of a "tidefall" is a spectacular drop from the cliffs down onto the beach.

Once thought to be the oldest living tree in the world, Methuselah was germinated before the Egyptian pyramids were built.

This Big Sur waterfall drops 80 feet directly into the Pacific Ocean, and inspired the hillside house up top.

The ghostly remains of an accidental sea.

Each year these high desert hills are absolutely covered with poppy flowers in a surreal show of nature.

Quite simply the largest tree in the world (by volume).

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