A layered tribute to the work of mosaicist Isaiah Zagar.

These remote Florida islands have a history of sea turtles and sunken treasures, and one of the world's largest coastal brick fortresses.

An enormous, inside-out glass globe built in 1935.

An emerald-green grotto just a short trip from Austin.

An immersive environment that is part haunted house, part choose-your-own-adventure, and part jungle gym.

On the Oregon coast there is a natural hole that seems to be draining the sea.

A collision of human error and natural geothermal pressure created this rainbow-colored geologic wonder.

World's first "penitentiary," meant to be humane, drove men insane.

A psychedelic labyrinth on the San Francisco bay.

La Monte Young and Marian Zazeela's "Dream House" will immerse you in an ever changing world of sound and light.

A huge musical instrument played by the ocean.

A cabin completely covered in coffee mugs, where visitors are welcome to leave one of their own—if they can find an empty nail.

This bright yellow relic is the final survivor of a short burst of seashell-shaped petrol pumps.

A sculptor's dream castle turned fantastical ruin.

These eerie outliers of the lightning bug family glow a mysterious blue color.

Mysterious ancient boulder carved with petroglyphs in the mountains of Western North Carolina.

This tombstone marks the final resting place of the beloved 1990's character, Ernest P. Worrell.

A whimsical folk art garden full of punny pieces and a diorama containing 3,500 toys.

An enormous goose sits atop this nest-shaped home.

Everyone and everything one man ever loved and lost, now stare into the East for all eternity.

An abandoned theme park with a strange and tumultuous past.

A ship that lived many lives under many names is now known merely as the "Ghost Ship."

Prehistoric animals decorate this popular outdoor park.

The world's longest known cave system.