About 80% of all U.S. avocados are descendants of Rudolph Hass's glorious tree.

Of all the origin stories for weed's secret code, this one likely has the goods.

Where the first "expert riders, willing to risk death daily" for the Pony Express were recruited.

Where the writer penned his famous story about a jumping frog.

The California capital city once stood 10 feet lower than it does today.

An Old West film set seen in countless TV shows and movies is open for the public to explore.

Two pillars set 10 paces apart commemorate the "last notable American duel."

The first high-tech company in the valley that actually worked with silicon devices.

This 1920s masterpiece of French Quarter architecture hides a secret tunnel used by Albert Einstein.

The awe-inspiring ship from the golden era of cruising has an incomparable history and a reputation as one of the world’s most haunted places.

One of the last remaining Carpenter Gothic churches is situated on a wildflower conservatory overlooking the bay.

The southernmost outpost of the Russian Empire in colonial America.

This magnificent mausoleum is as much a work of art as it is a historic resting place.

"The greatest unknown literary treasure in Los Angeles."

Scores of vintage street lamps shine along L.A.’s Miracle Mile.

This grand mansion has starred in everything from Bones to Buffy.

Stroll the grounds built by murder, suicide, and dirty oil money at one of Hollywood's most filmed mansions.

A 50-foot tile mural mosaic for the 100-year anniversary of the Statue of Liberty.

A long-vacant Scottish Rite temple in Hollywood has been converted into an art museum filled with Masonic relics.

This opulent hotel has been visited by Spider-Man, Charlie's Angels, and the Ghostbusters.

The legendary building that needed ghostly approval before being built.

The art and history of the velvet painting are on full display in this Los Angeles museum.

A master of deception, Harry Houdini's greatest trick may have been living in two places at once.

Hollywood's oldest hotel is the site of the first Academy Awards, the birthplace of Marilyn Monroe's career, and the home of Montgomery Clift's ghost.