View from the top of the Arch facing west into downtown. The main development is that the the depressed highway lanes no longer act as a moat between the city and the park grounds. The new park extension covers the road and creates an inviting path to the entrance to the new and greatly expanded museum. That's the circle near the center.
Here's a link to a similar photo from 2015. Although the picture doesn't come as close to the feet of the monument, you can see how access has changed for the better.