Sixty Stories Tall, Cascading
Go for a quick drive east of Portland, Oregon. Enter the Columbia River Gorge, winding above the southern bank of the river...and you'll be able to walk a short trail to Multnomah Falls—the height of a 60-story building, one of the tallest waterfalls in the U.S.
For more information, including driving directions: http://www.oregon.com/attractions/multnomah_falls