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

Now housed in a museum, this giant pink elephant stood in downtown Seattle for more than 60 years.

A wall of chewing gum moonlights as collective art.

The longest continuous lava tube in Oregon.

Eons old volcanic activity created one of the most stunning rock formations in the United States.

A massive hydrovolcanic explosion left a half-mile wide crater in Death Valley.

Travelers leave tea kettles in a remote part of Death Valley as part of a mysterious, decades-old tradition.

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

From the sky, a kaleidoscope of color brightens the grey landscape of the San Francisco Bay.

The black lab that was voted mayor of a California town is forever remembered by a life-size statue.

The old Niles Canyon Aqueduct in the San Francisco Bay Area is a bemusing and secret trail through nature for wayward travelers.

Sporting Brutalist architecture, this school is hidden amid a quiet suburban neighborhood.

Ozymandias’ time-keeping temple.

In Egypt's expanding metro area, many of the neighbors are dead.

An ancient capital city that dates back 3,000 years old and harbors many surprises.

Charnel house at the foot of Mount Sinai.

Where the polar bear watches over everything, and every drink is a double.

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