This lake in the Cascades lives up to its name, disappearing down a hole every spring.

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

The oldest operating apothecary in the US has treated everyone from Thomas Edison to Mark Twain.

The highest bridge in America was built for an almost unnervingly small amount of money.

This road in the Great Smoky Mountains was supposed to assuage a displaced community, but ended up a $52 million dead end.

The longest navigable underground river in the United States is home to countless blind and albino animals.

A 300-yard long natural tunnel runs through a ridge deep in the Appalachian Mountains.

The abandoned husk of a mental institution that failed to save a Jazz Age icon still sits nearly unchanged.

Hidden beneath a bridge, this waterfall is known for the large amounts of graffiti painted on its base.

After starting as a whimsical tourist attraction that eventually found its way to ruin, these renovated canals offer a lush and exotic locale on the Pacific Coast.

Trails through lava-carved tube-caves display sparkling bacteria and a rich history.

Couple's personal collection of pinball machines turned public pinball museum.

This charmingly homemade amusement park has been growing for 40 years.

A little piece of the Shire is hidden behind a plant nursery in Port Orchard, Washington.

Canyon walls shrouded in ferns.

An abandoned castle owned and ignored by Masons carries a cursed history.

This massive store is home to an eccentric collection of vintage, retro, and peculiar goods.

A meditative space out of a fantasy story.

A clear blue swimming hole with hidden caves, still unexplored.

The oldest surviving bridge in New York City, which reopened to pedestrians in 2015.

Ruins of the elaborate house where the enigmatic costume designer threw glamorous parties for New York's theatrical elite.

One of the most scenic stretches of road in America winds between some of the country's oldest trees.

A whimsical village of unique treehouses resides in a Washington forest.

The trials and tribulations of marking Poe's grave.