Well, since the United States is a rather large country, and has a huge stockpile of interesting facts, I'll narrow it down a bit. In Lancaster County, which is largely Amish country, there lies the small town of Intercourse. About 8 miles away from that town lies the town of Blue Ball. Since I live just outside of Philadelphia, a few friends and I go to a store in Blue Ball each week to play cards. There is, literally, a place in the road where you have to choose to either turn right for Intercourse or left for Blue Ball.
Furious Styles, there are four countries that do not have a codified Constitution. You mentioned the United Kingdom. The others are San Marino, New Zealand, and Israel. Then again, Isreal doesn't have a Constitution, at all.