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

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

A hidden subterranean installation offers a view of the sky.

An overlooked and unassuming engineering marvel.

These subterranean storage areas hold emergency water reserves.

This painted marvel is San Francisco's 400-foot ode to urban biking.

Gold Rush-era tombstones line the park's paths.

Adolph Sutro's little-known, geographically inaccurate, deprecated monument.

The most beautiful Taco Bell in the world even has surfboard parking.