High in the clouds of San Marino sits an ancient tower with some curious prisoner graffiti.

The world's largest reflecting pool is just two centimeters deep.

A charming desert roadside bakery that produces 10 times more bread daily than it has residents in its town.

Once thought to be the oldest living tree in the world, Methuselah was germinated before the Egyptian pyramids were built.

Wedding chapel's mysterious spiral staircase said to be miraculously constructed.

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

Home to one of the world’s largest collections of model yachts.

Approximately 250,000 people left homeless by the great earthquake and fires found shelter in Golden Gate Park.

Depicting scenes of everyday life - and specific individuals - in Great Depression era San Francisco.

A speck of nature and art in one of San Francisco’s most notorious neighborhoods.

Only hotel where you can legally launder money.

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

An enormous artwork that colorfully celebrates over 150 years of US military achievements.

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

An elaborate gift from Claus Spreckels is now a piece of San Francisco history.

A collection of memorabilia from the Beat era in the back of a San Francisco bookstore.

A man-made island in scenic San Francisco Bay.

Since 1973, this block has been home to the most concentrated collection of murals in San Francisco.

A promotional sun clock on the site of San Francisco's great raceway.

Golden Gate Park's historic collection of plants.

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

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

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

The restored and active Victorian-era final resting place of San Francisco.