This sculpture by artist Fritz Keonig survived the 9/11 attacks and now stands as a monument to the victims.

Church featuring "high Victorian gothic" architecture.

A drawbridge named for a potentially intersex Polish national who fought alongside George Washington during the American Revolution, and an example of "Pulaski Red".

Once a dumping spot, now a park with a kayak launch.

A decommissioned military complex that's now a modern industrial park.

The internal railway of one of the biggest steel plants in America has been transformed into a linear park with unique industrial views.

Two groundbreaking brothers from Pasadena.

One of Hollywood’s favorite government buildings.

"The Star Factory" cranked out Hollywood stars like nobody's business.

The simple auditorium that launched a pop icon's career into the stratosphere.

Former 1954 Del Mar Train Station now serves signature cocktails and delightful culinary treats, and still operates as a Metro stop.

Where the rich wintered in Pasadena.

A castle that was built stone by stone by an eccentric journalist.

Once the central jail for Los Angeles, this building housed inmates like Al Capone, those arrested from the Zoot Suit and Watts Riots, and individuals imprisoned for their sexuality.

First LEED-certified gas station in the United States.

These delicate buggers are some of the rarest fossils that have bubbled up from the Tar Pits.

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

The L.A. Zoo has a secret garden of rare bootleg cycads, a palm specimen dating back 280 million years.

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

The most iconic structure in Scotland has been home to bishops, colonels, and Sean Connery characters.

Looking strangely like Rome's Colosseum, this unfinished tower has dominated the skyline for over 100 years.

A solemn memorial in a majestic setting that honors a 1692 tragedy.

The 20th-century chapel’s intricate woodwork includes amazing details, most notably angels playing bagpipes.

A sweet symbol marks the place where torturous executions were once carried out.