Every year I visit my family in California in late March, and every year we try to find something new to see or do. This year, we decided to see Yosemite National Park. In a lifetime of visiting California, I somehow never managed to make it there. I've flown over it several times, but it's hard to see much detail from 30,000 feet. My mother and I drove eastwards from the Bay Area, passing whole hill-sides of windmills: The valley grew steeper and rockier, eventually coming right up to and sometimes even over the road: Finally we came across a...