One of the three perfect vellum copies of this historic book known to exist is on display in a specially-designed case.

The 5.5-mile ring of steel posts around the Capitol Building is one of the largest (and most uniform) of its kind in the world.

A derelict bit of infrastructure from the canal that once ran through D.C. is landlocked in the heart of the city.

A muscular Art Deco monument represents the struggle between regulators and unbridled markets.

A hidden gem on the lawn of the U.S. Capitol Building designed by landscape architect Frederick Law Olmsted.

A monument in Washington D.C. marks the spot from which all other roads were supposed to stem.

This statue celebrating early Hollywood is largely forgotten, while its twin replica at Walt Disney World has become an icon.

Overshadowed by the theme park opposite it, this small museum explores a major moment in American history.

Hidden away among the quiet streets of Beverly Hills, this small park is a haven for walkers and wildlife.

This museum is a music lover's introduction to the iconic venue.

A statue commemorating the heroic life of a Viking postman who was the Godfather of California skiing.

"The only replacement for a DC-3 is another DC-3."

A miniature train theme park, free to the public, laying at the base of the Santa Monica Mountains.

Pasadena glamour turned government issue.

A basement full of treasures lies beneath this inn that has worn many hats throughout its 140+ years.

Hiding amid the largest camellia collection in the country lies a charming children's maze, donated by a secret admirer.

The neighborhood of Eagle Rock is named after a gigantic boulder with a shadowy surprise.

This conservation area is also home to many of the region's desert tortoises.

This California estate was either haunted by ghosts or the Marx brothers.

A massive volcanic plug is now a protected area that hosts a number of bird species.

Originally the home of chewing gum mogul William Wrigely Jr, it is now the official offices of the Tournament of Roses.

A stellar example of Art & Crafts architecture, and a movie set to boot.

One of the largest helium balloons in the U.S. is a 112-foot ginormous orange.

NASA's leading space science lab started by a co-founder with deep ties to the occult.