For a few weeks in February, a spectacular sight draws crowds of visitors to Yosemite National Park. Each day, just before sunset, Horsetail Fall on the eastern edge of El Capitan gets a back-lit glow ...

This week, weather conditions at Yosemite were perfect for the annual “firefall”—when the sun strikes the park’s infamous Horsetail Falls at just such an angle to make it look as though the cascading ...