A 300-ship graveyard, with a few still visible at low tide.

Visible below the waves are memorials to the city's Gold Rush dead.

Staircase winds down the side of Telegraph Hill through gardens, wild parrots flying overhead.

A winding path built in secret on the edge of the continent.

This once bustling boomtown hotel is now the hottest spot in Nevada for ghost hunters.

Costumed elves and mountain bikers co-exist peacefully at this abandoned Christmas-themed adventure park.

Located on 420 acres in the high desert, this spiritual center is dedicated to the "science of the future."

Hundreds of trees made from glass bottles make up this forest on Route 66.

In the middle of an extremely unforgiving and desolate high desert is the most secret military facility in the world.

Millions of years of oxidation make a drive down this winding Death Valley road surprisingly colorful.

In the middle of the desert, miles from any human life, sat an anomalous pay phone that still magically answers your calls.

Huge hole looks down onto an underground beach populated with sea lions.

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

This private residence was the template for one of the most beloved television homes of all time.

San Francisco's newly reopened hands-on science museum.

A collection of 20th-century automata, penny arcade games, and musical contraptions.

A sign at the end of the Santa Monica Pier marks the traditional end of the legendary American highway.

America's most famous piece of self-built architecture.

Sports history, made in the Arroyo Seco.

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.

Pasadena’s Stonehenge.

This incredible collection of vintage pinball machines can be played at 25 cents a pop.

One of the world's tallest Ferris wheels takes visitors high above Las Vegas in a spinning party room.

The second-largest gold nugget in existence, displayed in a Las Vegas casino conveniently named the Golden Nugget.