San Francisco's cable car system

I simply love the cable car system run in San Francisco. This is a heritage line, the world's last manually-operated cable car system (refer Wikipedia). The line mostly runs from Union Square to Fisherman's wharf, and if you have not taken a ride in this before, you should certainly do so. They are not very fast, but are an excellent tourist attraction. Riding in them, you get a very good idea of the steep slopes of San Francisco's roads, and it is a different sort of pleasure riding on the steps of an open tram that is just going uphill or downhill on a steep road (if you refer the second photo).