The Tunnel View is probably Yosemite's most famous vista. Lots of well-known landmarks are visible here, including, from left to right, El Capitan, Yosemite Valley, Sentinel Rock, Cathedral Rocks, and Bridalveil Fall. Not appearing in this picture due to clouds are Half Dome and Clouds Rest.
If you enter Yosemite Valley via Highway 41, this will be one of your first glimpses of Yosemite Valley; you'll see this immediately upon exiting the eponymous tunnel just uphill from the viewpoint. If you entered Yosemite Valley via another route, follow the signs to Bridalveil Fall (or Highway 41), but continue uphill past the falls to this spot.