A scandalous Art Nouveau collaboration that set Paris all atwitter at the turn of the 20th century.

An overlooked marble is the only surviving in-place 18th century example of the measurement that changed how we define distance.

A lone cannonball remains lodged in the walls of the Hotel de Sens as a sober reminder of a revolution.

How did a French journalist’s grave become the sexiest statue in the cemetery?

France's most famous cemetery, with some of its most curious tombs.

The most accurate timepiece in the world.

There are lots of hands and feet stamped in the cement in front of Grauman’s Chinese Theater, but Mel left behind something extra.

Hollywood's most famous landmark, the "temporary" sign that has stood for decades longer than intended.

This glamorous old building is said to have inspired the Tower of Terror.

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

A house built from trash known as the poor man's Hearst Castle.

The unbelievably opulent home built for an infamous newspaperman.

Haunting and beautiful trees, doomed to die.

Staircase winds down the side of Telegraph Hill through gardens, wild parrots flying overhead.

Olfactory delights in San Francisco's Botanical Gardens.

The remains of a 12th-century chapter house in Golden Gate Park.

Golden Gate Park's historic collection of plants.

Once the largest windmill outside of Holland, with enormous 114 foot sails.

The key to turning shifting dunes into the green oasis of Golden Gate Park.

A walk-in working camera obscura produces 360-degree live images of the San Francisco coast.

Julia Morgan's Moorish-Gothic labyrinth of fountains, trees, natural light and Oakland's notable dead.

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

Join the circus for a few lessons to learn clowning, acrobatics, and Chinese contortion.

See 150 million-year-old dinosaur tracks and bones dating back to the Jurassic period.