A roaring, awe-inspiring double cascade of icy water flows through woodland Oregon like something out of a Tolkien novel.

A giant Troll lurks under one of Seattle's oldest bridges.

For two weeks every June, fireflies in the Smoky Mountains perform an astonishing light show.

A layered tribute to the work of mosaicist Isaiah Zagar.

Crystal clear lake with a shoreline of travertine located in a Colorado canyon.

Manhattan’s Battery Park has a whimsical carousel full of spinning, glowing fish.

The abandoned zoo enclosures offer a perfect place to experience the other side of the bars.

A bizarre house filled with an astounding array of collections.

The only structure left with direct ties to the Salem witchcraft trials of 1692.

The installation’s official name, “You Who Are Getting Obliterated in the Dancing Swarm of Fireflies,” says it all.

A theme park that suffered massive flooding during Katrina was abandoned, and now proves irresistible to trespassing explorers.

Remants of foundations, streets, and streetcar tracks inhabit the cliffs where a landslide occurred in 1929.

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

These old stone ruins in the Oregon wilderness were once bathrooms and are steeped in legends of murder.

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

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.

Rippling sand dunes frozen in the Arizona rock.

This iconic L.A. bookshop is housed in an abandoned bank—both symbolic and chic.

A psychedelic labyrinth on the San Francisco bay.

Inspired by a foil-wrapped potato, (seriously) the Markel Building has been deemed one of the 10 ugliest buildings in the world.

The skeletal white beams stand as a monument to religious dissent.

This beautiful vintage movie palace has seen little change in form or function since the 1920s.

This museum devoted to the gothic author holds such interesting ephemera as his socks and walking stick.