Hi,Rafael..I was in St Louis two weeks ago and it was a great city. I was there for the day but was able to see the Arch. It was spectacular and for the first time I got to see the Mississippi. Just so you know, if you are going to take the time to see the arch, you need to allow a few hours if you want to go to the top. Not that it takes that long, but there are so many people wanting to go up that it takes that long. I do believe you can buy a ticket ahead of time online. Just wanted you to be aware. I took a lot of photos and also a lot of photos of Springfield, Illinois. I hope you are doing well and I wish you the b est on the rest of the trip.