The only castle in North America to ever house European sovereigns.

Gilded heaven for philatelists and architecture freaks, still in full working order despite sitting atop tremulous ground.

66,000 pieces of art, donated by one of the world's richest men.

A jaw-dropping "megalibrary" that turns book-browsing into a geometric adventure.

Part bookstore, part café, and part forest.

Devilish landscape, once cinema home to giant alien bugs, now derelict roadside attraction.

An Ancestral Puebloan ruin that appears to burst into flames in the sunlight.

Pyramid home to an obscure religious group that practices modern mummification.

An earthwork sculpture built by Robert Smithson in the Great Salt Lake only reemerges during drought.

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

Incredible sculptures inspired by obscure passages from the Bible.

A shady solar power system that couldn't hold up to the harsh desert conditions.

Hundreds of drawings left by the land's previous inhabitants remain mysterious.

An absolutely beautiful 200-foot stained glass installation traces the evolution of knowledge.

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

A well-preserved Ancestral Puebloan ruin tucked beneath a desert cliff.

Dig for your own trilobites in this goldmine of invertebrates.

Here, at the "world's longest art gallery," you'll find forty miles of ancient petroglyphs and pictographs.