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

The rocks in this arid basin leave trails of movement behind them.

A psychedelic labyrinth on the San Francisco bay.

During prohibition, corrupt city officials ran drinking dens under the streets of Downtown Los Angeles.

On the side of Arkansas' Great River Road stand the remains of a forgotten World War II POW Camp.

A mysterious light floating in the trees of Arkansas may be a piezoelectric effect.

The artist James Turrell is repurposing an extinct volcano crater as an observatory to experience the cosmos.

A reproduction of earth's many biomes.

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

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

Rippling sand dunes frozen in the Arizona rock.

Permanent exhibit reminds visitors of the Exxon Valdez.

This frozen tunnel in central Alaska is both an engineering feat and a valuable climate classroom.

This whimsical stacked cabin looks like something out of a children's book.

Mind-blowing carvings and fantasy ice scenes grace the largest year-round ice environment in the world.

Founded by a man who called himself the greatest hunter alive.

Monument to the cotton-destroying boll weevil.

This architectural triumph is the only Frank Lloyd Wright house in Alabama.

The remains of an idyllic small town built for the film 'Big Fish' still stand around a rundown main street.

Shocking dioramas of human torture, meant to promote human rights awareness.

A giant "X" symbolizes the blood spilled from the brutal Juárez drug wars.

This ceremonial Mexican square looks as though it belongs in a science fiction movie.

A Lovecraftian altar of nightmarish bronze chairs sits ominously on a boardwalk in Puerto Vallarta.

This crumbling Art Deco movie palace in Mexico City has been abandoned for two decades.