A century and a half of research in the sciences and natural history, still going strong.

San Francisco's newly reopened hands-on science museum.

San Francisco's most expensive hotel suite includes a secret passageway rumored to have been used by JFK.

The ghostly remains of an accidental sea.

See massive fossils that are over 200 million years old in northeastern Arizona.

What is the Thing?

This immigrant bridge once spanned the Thames but is now a fixture of an Arizona city.

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

America's only nuclear missile silo open to the public.

A planet-hunting astrograph built in the 1920s to seek out the so-called "Planet X" beyond Uranus.

This Arizona observatory is famous for investigations into Martian life, and as the place humans first spotted Pluto.

The massive, incredibly rare instrument is over 11 feet tall with a range so deep it goes lower than humans can hear.

Originally conceived as part of a proposed Arizona State Capitol building in the 1950s, this structure built in 2004 stands as a monument to the architect's legacy.

One of the largest free-standing structures ever built, this dirigible hangar is now simply a giant skeleton.

The oldest lighthouse on America's west coast no longer needs keepers, yet they maintain the site anyhow.

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

One of the most elaborate displays of Jellyfish is on display at the aquarium.

Thousands of migrating monarchs overwinter clustered amongst the eucalyptus trees.

Once America’s most beautiful army base, this abandoned military fort on the coast of Monterey Bay has been left to the elements.

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

A cozy bookstore is tucked within an old gold mine shaft beneath the cafe and ice cream shop.

The interior of the Overlook Hotel in "The Shining" was based on this Yosemite original.

A water tower shaped like a giant coffee pot looms over a small Swedish village in Central California.

A mysterious chasm in the heart of the ancient Roman Forum, the Lacus Curtius was once believed to be a gateway to hell.