A common entry point to the Griffith Observatory trail holds its own wonders.

A popular swimming hole that hides one of America's most deadly diving spots.

148 feet long and in the middle of a verdant forest.

One man's ambition created this psychedelic log home.

In 2010, Nicolas Cage purchased two plots in this cemetery using one to construct this strange pyramid mausoleum.

Despite being one of the most photographed vistas in the Rockies these twin peaks are rightfully known as the "Deadly Bells."

A wall of chewing gum moonlights as collective art.

Tucked in a nondescript downtown Brooklyn mall is a bar containing a remarkable turn of the century anatomical wax collection last seen in 1920s Berlin.

A wondrous old library overlooking the nation's capital.

A pedestrian island in the middle of world-famous Times Square emits a strange (and purposeful) humming noise.

The eerie remnants of an ancient forest were hidden under the sand for centuries.

A half-mile long and three stories high, this bridge over the Des Moines River Valley mimics a descent into a mine shaft.

The lush coastal city of Astoria is riddled with forgotten secret sidewalks.

A modern mechanical planetary system, part of a 10,000 year clock.

Visible below the waves are memorials to the city's Gold Rush dead.

An inconspicuous footbridge beloved by San Diego locals.

Visit this playground of waterfalls, caves and sinkholes.

An extraordinary mixture of natural beauty and man-made phenomena.

This Florida sinkhole hides a rainforest-like micro-environment in its depths.

The oldest surviving synagogue in New York City is now a soaring art space.

The oldest Italian café in Boston, this spot also serves as a veritable museum of vintage coffee ephemera.

These beautiful ruins deep in the Pennsylvania woods are thought to have been a ski lodge or a speakeasy, but no one really knows.

A ghost town at the airport is now a refuge for blue butterflies.

The world's oldest hologram gallery and the labyrinthine laser laboratory of a holography pioneer.