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

A small Richmond island dotted with the remnants of hundreds of years of history.

A lion given to the prime minister somehow got stuffed and sent to Florida.

It's a pretty creepy lock-up.

This large midwestern cavern features impressive rock formations and an underground waterfall.

The shelves in the back of this thrift store are devoted to saving, not selling, retro tech.

This small hut in the middle of a parking lot was once the wooded sanctuary of the 'Hermit of Montrose.'

Hundreds of hopeful gold miners came here to get rich, but only two years later the small town was deserted.

Ghost stories surrounded this “castle,” the only structure from a huge mansion that was never built.

This abandoned school has had many lives since the early 1900s, and all of them doomed.

The abandoned grounds and derelict greenhouses of this once-magnificent Edwardian estate are now a nature preserve open for exploration.

A giant, Gilded Age mansion that once belonged to the beer baron of Milwaukee.

The largest retailer of seashells in the world.

These expertly crafted, scientifically accurate glass sea creatures were once an international phenomenon.

One of America’s oldest and spookiest hotels, thanks to the residency of ghosts, dead presidents, and Alfred Hitchcock.

The final resting place of the camel who served with the Confederate Army during the Civil War.

A stone arch leads to a cavernous 1930s spring house tucked away in the Pennsylvania woods.

The abandoned bathhouse is all that remains of the hot springs considered Florida's original tourist attraction.

Fittingly, America's museum of architecture is itself a magnificently designed old building.

The Zalud family experienced a number of tragedies in one decade, giving rise to rumors that the 19th century house is haunted.

Once America’s most beautiful army base, this abandoned military fort on the coast of Monterey Bay has been left to the elements.

In the woods of New Jersey lie the ruins of a munitions village abandoned after World War I and the remnants of a 1920s wooden racetrack.

The old Route 66 town straddling Texas and New Mexico died along with the Main Street of America.

An alternate history park where the Union Army loses the war... to dinosaurs.