The second-largest giant sequoia in the world.

This lonesome Monterey cypress has survived centuries of wind, salt, and at least one attempt at arson.

Red sandstone structures dominate this landscape, which has been inhabited for some 5,000 years.

This rusted car found in Petrified Forest National Park's Route 66 exhibit may be the most photographed abandoned car in the country.

This oversized flute-playing Ancestral Puebloan deity is also a landmark of Southwestern kitsch.

This canyon is named for a unique geologic formation where the river vanishes underground near the mouth of the canyon and reappears farther down.

One of America's largest retail chains got its start in one of its most remote rural destinations.

Named for a prominent scout and explorer, this Wyoming state park encompasses a replica of an 1840s trading post, a 19th-century Army outpost, and early 20th-century automobile lodgings.

The world's largest mineral hot springs is home to a herd of bison, a free public bath house, beautiful mineral formations, and a terrifying swinging bridge.

An architect's childhood fantasy treehouse made real.

Nature has shaped this drainage tunnel into the digestive tract of a mighty beast.

In 1847, Brigham Young climbed this hill to survey the Salt Lake Valley and saw a fine place to build a city.

Although it also features red, orange, and variegated cliffs of Navajo Sandstone, this state park is often overshadowed by its more famous neighbor.

A unique collection of drawings that represent Fremont Native American culture.

Colorful sand dunes create a unique attraction in this part of Utah's red-rock country.

This raised bulls-eye visible from space was the subject of an intense geologic controversy.

Few things look more out of place than the electric blue ponds in the reddish-brown desert of Utah.

In the middle of a Vienna square, Roman ruins dating back some 2,000 years are on display.

Fantastic stories on a miniature railroad.

Austria's ultra-modern art museum looks like Cthulhu's giant alien heart.

Resting in the middle of an Austrian river, this sci-fi "island" lets people cross in neon style.

Vienna's diversity-themed traffic lights were inspired by the Eurovision Song Contest.

Double spiral staircases are not unheard of, but they are very rare.

Vienna's giant wonder wheel had a starring role in one of the greatest noir movies of all time.