The St. Louis Arch is located in Downtown St. Louis right along side the Mississipi River and on the border of Illinois. It costs $10.00 to take a trip up to the top as an adult. The entrance is at the base of the arch. It is best to try and find out what the weather will be like prior to the time you do choose to go to the top. The weather can have a great bearing on the viewing conditions so it is best to try and plan your trip during nice weather when the views are the most breathtaking.
Upon entering they do have security and all of your items are scanned. So be prepared for this. The arch base has a museum that is fun for children as much as it is for adults. There is an area that goes over much of the United States history including the travels of Lewis and Clarke and animated Confederate Soldiers and American Indians.
The only food here can be found in a little shop that sells chocolates and jams with everyone dressed as they were in colonial times as well as the structure of the shop being built as such.
In the Summer and Spring months there is a large park area around the arch similar to the area around the Eiffel tower in France if one has been there. So one can plan a picnic or bring a football or frisbee to throw around in this expansive area.
Overall it is an amazing experience for the view as well as from a historic perspective.