An architect in Aspen used psychedelics as his muse while building this mushroom masterpiece.

The ghost town that ended up on Ebay.

First a horse rendering plant, then a 19th century landfill, this beach is full of glass from thousands upon thousands of broken bottles.

A swing to dangle you off the very edge.

Treehouse motel and treehouse-building school.

This whimsical castle of grottoes was the labor of love of a French postman, and one of the greatest achievements of outsider architecture.

The lowest point in North America is home to an undrinkable pool surrounded by fields of geometric salt flats.

A Victorian mansion, painstakingly reproduced to appear just as the the Munster's family home did on TV.

An extraordinarily ornate museum in San Diego holds wondrous anthropological treasures.

This historic national park is covered in the stunning ruins of red rock pueblos.

The ruins of this antebellum sugar plantation are the end result of a Seminole attack during the Florida Wars of 1836.

The doodles of a genius line the walls of a secret room under the Medici Chapel, where they were hidden for nearly 500 years.

Sleep snuggled in a sphere suspended atop the forest canopy of Vancouver Island.

An abandoned vacation home spent a decade taking on legends. It's now taking on water.

This concert pavilion on the shore of the Great Salt Lake has been destroyed by fire, water, and disinterest but keeps coming back.

Disney's abandoned animal island is now an overgrown ruin that was almost the coolest attraction ever.

The best Tiki bar in Las Vegas.

A picture-perfect town, perfect for blowing up.

An unfortunate geological resemblance to Satan has labeled this Pasadena gorge as a passage to the underworld.

This rare example of a "tidefall" is a spectacular drop from the cliffs down onto the beach.

Finale of "William Tell Overture" can be heard as drivers pass over grooves in the road.

The largest permanent Monopoly board makes one of the longest games even bigger.

Stalactites and stalagmites in a beautifully lit cave.

Town of spiritualists and mediums in Florida.