— This image of the St. Louis Arch has a wonderful combination of jagged, organic lines and smooth, man-made lines. I also like the contrast of light and dark areas of the frame, and the near absence of color. If you've never been to the Arch, it's totally worth the trip. Did you know you can ride a tram, inside the arch, to the top? At 630 feet, it's the tallest inhabitable structure in St. Louis.