A planet-hunting astrograph built in the 1920s to seek out the so-called "Planet X" beyond Uranus.

This magnificent natural sandstone bridge is one of the largest in the world and is an iconic symbol for Lake Powell.

A late-19th century diversion canal built by hand crosses Bryce Canyon National Park and is still in use.

This site is home to ancient petroglyphs and pictographs dating back to 6,000 B.C.

This prehistoric karst cave is situated near a working ranch and historic warm springs.

The natural history of Utah is on full display inside this museum.

This pristine World War II airfield gives a comprehensive look at atomic development and aviation history.

Beneath the surface, something slithers. And if you find it, prepare to be slimed and glowing.

Beside some power panels, a plaque celebrates the history of an alternate world.

An unprepossessing storage reservoir in southern Utah has a checkered past.

This former wildlife sanctuary is being transformed into an art park.

Designed in 1887, this clock from the county office clock tower has been restored and is on full display.

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

In 1952, this restaurant began selling the Colonel's “secret” recipe.

The damming of the Colorado River buried an iconic geologic formation before record-breaking drought brought it back.

This mural changes every few years.

This World War II-era bunker is now packed with posters and props from movies and TV shows filmed nearby.

A Hawaiian stairway to heaven—that you can't climb.

What remains of the summer palace of King Kamehameha III.

A 1940's shrine dedicated to drowned fishermen on the outskirts of Honolulu.

This WWII plane died a quiet death, and is now a garden eel playground.

Doris Duke's lasting collection of Islamic Art, hidden in a Hawaiian paradise.

Hiding in plane sight.

On Waikīkī Beach, a monument to four extraordinary individuals of dual male and female spirits who brought the healing arts from Tahiti to Hawai'i.