A giant donut stands as a popular symbol of Los Angeles iconography.

California's own medieval Italian castle, authentic down to the 300-year-old iron maiden in the dungeon.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

The one-time watch house for incoming ships at the Golden Gate now stands abandoned and hidden in trees.

These delicate buggers are some of the rarest fossils that have bubbled up from the Tar Pits.

Hollywood's most famous landmark, the "temporary" sign that has stood for decades longer than intended.

High on a hill overlooking Los Angeles lives a world famous, high power conical Tesla Coil.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

Civil War dumping ground for the bodies of terrorized Union sympathizers.

A trio of colossal statues spread across a Dallas neighborhood chart the emergence of a giant robot born of a locomotive and spilled gin.

This downtown Dallas art installation is always on the lookout.

A gorgeous garden oasis with winding paths, stone bridges, and a troubling history.

Housed in a century-old building, this museum's dedicated not just to soft drinks, but to the free enterprise system.

Visitors can walk over the largest concentration of Columbian mammoths to have died from one event.

The Grand Canyon of Texas.

A Victorian mansion, painstakingly reproduced to appear just as the the Munster's family home did on TV.

A popular swimming hole that hides one of America's most deadly diving spots.

A sculpture made of 10 Cadillacs as a monument to the "Golden Age" of the American automobile.

Pre-Incan aqueduct amidst a stone forest in Peru.

Preserved Inca city and site of the last Inca stronghold against the Spanish conquistadors.

Locals dubbed it the "Owl Building" because of its bird-like appearance.

This museum showcases the history and contributions of the U.S. Army to the medical industry, both on the battlefield and off.

Established in 1925, Kiddie Park claims to be the oldest amusement park in the U.S. - a cozy little time warp nestled in a shady corner of the modern world.

A National Historic Landmark with a scenic clock tower and park filled with deer and peacocks, plus a military museum.