What's left of the ruins of the 1893 Columbian Exhibition, or World's Fair, also known as the White City.

A plaque marks the site directly below the mid-air detonation of the atomic bomb over Hiroshima.

Only known mainland rookery of the threatened Stellar sea lion.

The first park built over a freeway is a brutalist masterwork.

The L.A. Zoo has a secret garden of rare bootleg cycads, a palm specimen dating back 280 million years.

The so-called "Statue of Liberty of Los Angeles" is on a one mutant mission to keep L.A. weird.

This hilltop park offers magnificent views and a Frank Lloyd Wright masterpiece.

A tribute to Ponce de Leon's supposed quest for eternal youth.

Jesus' footprints and the first catacombs in the world.

Stroll the grounds built by murder, suicide, and dirty oil money at one of Hollywood's most filmed mansions.

This narrow canyon has been carved by the river over thousands of years into spectacular and curious forms.

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

The unbelievably opulent home built for an infamous newspaperman.

A modern day curiosity cabinet.

This bar named after the world's first mixed cocktail was home to one of New Orleans' most notorious politicians.

The taxidermied remains of Charles Dickens' pet raven, which helped inspire one of Edgar Allan Poe's most famous poems.

The now-abandoned tunnels were built for the transcontinental railroad on the route where the first wagon train entered California.

A luxurious 1880s hotel with its fair share of Tiffany stained glass, Edison electricity, and of course, ghosts.

Macabre headstones carved with winged skulls, dancing skeletons, and pithy reminders of impending death.

This ultra-modern home clings to the slope of the Hollywood Hills on a precarious stilt.

Architectural monsters are devouring this palace's every door and window.

The second largest waterfall by volume in the U.S., Willamette Falls is outdone only by Niagara in the amount of water that is pushed northward.

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

Standing in a state of "arrested decay," this ghost town allows for a detailed peek into Gold Rush life in an unusually harsh climate.