The Cable Car Museum: The Engine That Moves a City

1201 Mason Street in Nob Hill. Free, small, and deafening. The thing the museum is about is happening directly beneath your feet: the working powerhouse for San Francisco's cable car system, massive sheaves and winding wheels spinning behind a low railing, filling the room with mechanical roar.

Four sets of fourteen-foot wheels turn continuously, pulling 11.5 miles of steel cable through underground conduits at constant 9.5 mph. The cable car operator grips the cable with a mechanical clamp to move, releases to stop. The whole system is essentially a Victorian ski lift laid flat. Andrew Hallidie invented it in 1873, reportedly after watching a horse-drawn streetcar accident on a steep hill.

The collection includes three antique cars, including Car 8 from the 1880s that was used as a garden shed for decades before being rescued. The seats are so narrow they make you realize 19th-century people were smaller, or more tolerant of discomfort, or both. The cables wear out every few months and are spliced by hand by a team of splicers who are among the most specialized workers in American transit. Free, daily. Stand by the wheels and feel the vibration come through the floor into your bones.