Medicinal spa created with the discharge from a geothermal energy plant.

An art collective teaching the more fiery, metal-y art forms.

A winding path built in secret on the edge of the continent.

Shoot for par over the bodies of the dead on this cemetery-cum-golf course.

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

San Francisco’s century-old Christmas Tree.

Carnivorous plants, medieval aphrodisiacs, and the largest original wood structure glass conservatory in the western hemisphere.

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

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

Over 315,000 preserved amphibians and reptiles in jars.

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

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

Golden Gate Park's historic collection of plants.

Barely visible foundations remain where Stow Lake’s “observatory” once welcomed visitors.

An artsy hidden staircase leads to breathtaking views of San Francisco.