San Francisco’s century-old Christmas Tree.

The unedited photograph called "Bliss" has graced the screens of over a billion computers.

Bug-devouring flora are the stars of a special wing of the glass conservatory.

This giant shopping mall still holds signs of its automotive past.

Every year, over 25,000 monarchs overwinter in Pacific Grove.

Haunting and beautiful trees, doomed to die.

Fake rail crossings mark the site of an influential doctor's demise.

Coastal dunes, site of buried Egyptian movie set and former utopian colony.

Strange red rock formations that have been attributed to a higher power for hundreds of years.

Home to Hollywood history and a very special salt crystal.

The world’s largest combined collection of U.S. and Russian aircraft got its start in a poultry building.

Marking the spot where a conquistador gave up his search for the fabled Seven Cities of Gold.

The grandson of a Kiowa chief created what has become the iconic symbol of a city on the Plains.

This downtown Dallas art installation is always on the lookout.

Look closely and you’ll notice that the color changes a third of the way up the tower.

Soldiers were buried next to Lee's house in the center of Arlington Cemetery to dissuade the general from reclaiming his property after the war.

A desert ghost town—occupied for only 12 years—was once home to more than 500 silver mines.

Decommissioned experimental solar facilities that pioneered solar energy technology.

The Denver airport is guarded by a 32-foot-tall sculpture of a demonic horse.

When zealous marijuana enthusiasts kept stealing the "Mile 420" highway marker, the State of Colorado got creative.

The youngest volcano in Central America.

Volcanic activity causes small pools of super-heated mud to boil furiously.

A pocket of jungle amidst urban expansion in Panama.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.