One of the largest free-standing structures ever built, this dirigible hangar is now simply a giant skeleton.

An extensive collection of ancient Egyptian artifacts and mummies.

Here, visitors can swing with the waves of the Pacific Ocean.

This quirky roadside attraction dives into the many theories surrounding North America's most infamous hairy cryptid.

This Big Sur waterfall drops 80 feet directly into the Pacific Ocean, and inspired the hillside house up top.

This stretch of beach along California's central coast is a busy highway for the largest seal in the northern hemisphere.

A massive volcanic plug is now a protected area that hosts a number of bird species.

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

An artist's vision for connectivity spans seven continents and 16 countries.

A regular looking rock with an unbelievable history.

These lush groves of fan palms rise up like oases out of southern California's Colorado Desert.

The ghostly remains of an accidental sea.

An off-grid art installation that encourages its visitors to imagine a world without waste.

This abandoned Navy base was transformed into an off-grid alternative living community for thousands of people.

A hand-built folk art installation covered with messages of God's love.

Version of the French Riviera destroyed by the sea.

Burping, gurgling geothermal mud pots by the Salton Sea.

An artsy hidden staircase leads to breathtaking views of San Francisco.

When it was built in 1929, this historic bridge was the only place to cross the Colorado River for 600 miles.

This iconic 1958 tower welcomes air travelers to Tucson with neon-lit letters and architectural style.

Every year, festive decorations appear on this juniper tree located in the median strip of a busy highway.

A scrap-metal sculpture recalls an infamous 19th-century camel.

This memorial pyramid marker honors one of the United States Government's first official camel riders.

After a short-lived attempt to bring America in line with the rest of the world, this road was left in metric.