I wonder what these could be?

Game time! I've provided three clues as to what Route 66 stop I'm describing, can you figure out what they are? Answers are beneath the questions, let the games begin!

Answer: Meramec Caverns

Answer: The Gateway Arch

Answer: The Grand Canyon

Answer: Elmer's Bottle Ranch

Answer: Polly Gas Station Sign

Answer: World's Largest Catsup Bottle

Answer: Monks Mound

Answer: The Rainbow Bridge

How'd you do? Let me know in the comments below!