Probably one of the most iconic features of Yosemite Valley, Half Dome is a site to be seen. You can hike the 16 mile round trip to the top of the dome, but it is only recommended if you are in a shape for an extremely rigorous hike, and you need a permit. You will gain nearly 5000 feet during the climb, most hikers take 10-12 hours to complete the trip. If you are prepared, the reward is well worth the work. You will see amazing views of Yosemite Valley, Vernal & Nevada Falls, Liberty Cap and the High Sierra.