This large, castle-like structure is hidden amid the mountains on the grounds of the Utah State Hospital.

The only ski tunnel in North America provides easy access to amazing snow and beautiful views.

It's safe—and permitted—to walk across these twin natural sandstone arches.

An empty mine that some believe will suddenly be filled with fortune and treasures at the end of the world.

Erosion and various mineral deposits give this striking canyon its distinct color and soft appearance.

Visitors to this library are in for a real-world education in modernist architecture.

The remains of this early 20th century refinery loom on a mountainside like a graffiti-covered fortress.

Local lore holds that Butch Cassidy took an escape route through Red Canyon's sandstone hoodoos after an attempted murder.

A small oasis not far from downtown Moab.

A ghost town that held steady longer than most, but finally gave up the ghost.

A striking, menacing sandstone peak towering above a landscape that's equal parts Mordor and the Moon.

A Mars simulation in the southern Utah desert.

This ghost town was once a cult-like religious utopian settlement.

Largest collection of mounted dinosaur specimens in the world.

Despite its name, this route in southern Utah offers a heavenly day trip.

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

Settled by the Church of Jesus Christ of Latter-day Saints in 1859, this abandoned frontier town has appeared in several films.

A replica that won't float away.

Come for the speed, leave in love with the desert.

This concert pavilion on the shore of the Great Salt Lake has been destroyed by fire, water, and disinterest but keeps coming back.

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

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.