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

One man's homage to the sun continues to grow like a glass fractal.

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

One man has carved a number of natural New Mexico caves into psychedelic sandstone temples.

Under the right circumstances, this waterfall in Yosemite briefly turns a luminescent fiery orange.

Wondrous sandstone hoodoos where Native Americans collected clay for pottery, 9,000 years ago.

This secluded aqua waterfall in the Grand Canyon is the perfect swimming hole, and the Havasupai tribe's fiercely protected natural wonder.

Dramatic river bend surrounds a natural red-rocked pedestal.

High on a hill overlooking Los Angeles lives a world famous, high power conical Tesla Coil.

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

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

Amid the bustle and noise of the Financial District hides a secluded garden oasis above the city streets.

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

Most-visited and most-photographed slot canyon in the American Southwest.

Bring your own cardboard to the slippery slopes of concrete hidden in a neighborhood park.

Rippling sand dunes frozen in the Arizona rock.

An artsy hidden staircase leads to breathtaking views of San Francisco.

A huge musical instrument played by the ocean.