Billed as the largest earth-filled dam in the world, it is the tallest dam in the United States at 230m/770ft, and the top of the dam spans 2,110m/6,920ft. The view over the Sacramento Valley is stunning, especially after a good rainstorm. Just be advised that due to some reason given in the name of possible terrorism, you can't park directly on the top of the dam. There are also quite impressive tours under the dam showing the massive hydroelectric turbines, although the hours and offer of these tours are unpredictable.