The most beautiful waterfall in the North American continent wallpaper | Horsetail Fall is one of the most beautiful waterfalls in the North American continent. But the waterfall is really nothing special for two weeks a year. Travelers should find a much more beautiful. When the proper natural conditions, travelers can enjoy a unique spectacle where water turns into burning fire. Over the last two weeks of February, when the sun shines above Yosemite Valley, and pour water into dindinggranit, Firefall phenomenon will occur. But because clouds and storms are common during the winter months, and sometimes California has dry season, Horsetail Fall Firefall only rarely be seen.