While my dad and me were on our way to New Mexico. We stop at a monument that is located in AZ, CO, NM, and UT. It is called the Four Corners. It’s a little area where all four states that connected with the corners of the states.
They have a place where you can take pictures of you standing on all four corners. There are little vendor areas where people from each state sale items.
I have been to four states all at once this trip.