Collected by Anita Wentworth
Dipsea Trail, Mill Valley, CA 94941, USA
Beginning in Mill Valley, the 7-mile-long Dipsea Trail runs up and over Mount Tamalapais, with more than 2,300 feet of steep, often slippery, uphills and downhills. (This is also where the Dipsea Race unfolds, the oldest trail race in America.)...