A massive bur oak tree believed to be some 500 years old is the centerpiece of this quiet urban greenspace.

In the Shawnee National Forest, amazing rock formations peer through the treeline.

Olfactory delights in San Francisco's Botanical Gardens.

A pair of slides and a tree-lined stair corridor have been an urban oasis for nearly 40 years.

Relics of the 1894 Midwinter Exposition continue to delight visitors today.

Get lost in this haunting fairytale art walk through a man-made eucalyptus grove.

The randomness of this wall of lava lamps helps encrypt up to 10 percent of the internet.

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

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

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

This shop and studio is dedicated to the art of the book, from letterpress to bookbinding.

A still functioning vaudeville carousel that has operated for over a century boasts a colorful menagerie and past.

Golden Gate Park's historic collection of plants.

Nestled in the heart of San Francisco’s bustling Financial District stands a unique homage to the Mayan and Beaux Arts.

This concrete tangle of square pipes has stood as a proud thorn in the city's side since the '70s.

San Francisco's urban bison herd has persisted in the face of extinction, development, and disease.

The oldest burial ground in the city, final resting place of city founders, Ohlone natives and murderers alike.

With the touch of a button, you can read a randomly selected short story.

Tenacious mummies survived dental problems, eternal entombment, and more than their fair share of devastating fires.

A library and museum dedicated to typography.

A monument to the love people have for their pets.

The stones that traveled from Spain to eventually become a holy place for San Francisco's nature worshippers.

This 19th-century church is now a popular roller rink.

This turn of the century masterpiece has a mysterious goaty interloper.