A statue of Malcolm Martin sits up there, and you can tell all your secrets to him if you would like. You might also, as we did, call family and tell them to go to the live cam at the top so you can wave to them.
Also on the property is the Gateway Geyser, claiming to be the tallest fountain of water in the United States and the third tallest in the world. This geyser shoots 630 feet into the sky for ten minutes at noon every day, matching the height of the Arch on the Missouri side of the river. We didn't get to see the geyser on this day, but we were able to catch it from across the river on the next day.
This is something of a bonus as we saw the fountain between a boat cruise and our visit to the Gateway Arch itself. We'd love to stand closer to the fountain on our next visit and get a better idea for its 630-foot spray.