90 miles to the Gateway Arch

After spending about an hour trying to find places on Route 66, we decided to get back on I-55 and head for St. Louis.  I have discovered that Route 66 is not the easiest to find nor stay on as it isn't well marked.  Here and there they have "Historical Route 66" signs but they are very hard to follow.  For today anyway, we are going to the Arch in St. Louis and check out some caverns and/or caves.