Observation Point is a hill about 250 feet high near Yellowstone's Upper Geyser Basin. It's a short but somewhat steep hike up the hill, but definitely worth it for the eagle's eye view it gives you of the basin and surrounding area. It also gives you a unique opportunity to observe Old Faithful blowing its top from above.

As you can see here, if you go to see Old Faithful during the middle of the day in the summer, you never have to worry about being lonely. ;)