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

Where manatees are the snowbird vacationers in these balmy Florida springs.

Rustic natural hot springs in the deciduous rain forest.

A huge musical sculpture and other art installations on the National Oceanic and Atmospheric Administration grounds.

Take a drunken tour inside the world's largest known geode.

The world's longest known cave system.

One part local history, 99 parts gruesome haunted house.

The seawater playground of gilded-era San Francisco burned to the ground in 1966.

Where beautiful signs live on forever.

A hands-off space for graffiti artists to hone and display their skills.

A speakeasy takes on Chicago's drinking culture.

This unique structure in suburban Austin is made up entirely of other people's castaways, and constantly changing.

The longest hedge maze in the world.

A collection of oddities including Dr. Kevorkian's suicide device, the Thanatron.

This charming cobbled backstreet is the most Instagramable street in Paris, much to the residents' annoyance.

A haunting collection of the vanished and disappearing natural world.

A museum and shop on Bourbon Street located in the former home of the second Voodoo Queen of New Orleans.

This New Orleans tree is filled with hidden chimes that produce a carefully tuned melody.

The remains of a failed attempt at medieval nerdery are hidden deep in the woods of Virginia.

Just a few miles from downtown Atlanta is a trail covered in a crazy collection of outsider art.

This abandoned asylum was once a state of the art facility before devolving into one of the most deadly mental institutions in American history.

An easily overlooked stretch of ornate window fronts and gaslight lamps that could be right from the pages of Dickens.

360° views of the city plus five floors of optical illusions and hands-on science.

Hollowed out cedar log tubs set in an ancient towering forest.