Great example! They left historical markings for education purposes as well. People do it now because they feel entitled to do whatever they want with nature leaving behind a mark that says, I'm a d*ckhead and the world revolves around me! One person carved their name into an aspen tree near where I live and now the entire forest has names carved on every tree and it looks like trash.I've seen people complaining about how it was done back then why can't I scratch my name too. What they don't realize or know is that was a way for them to communicate with others on the trips across the country. It let family members and others know you had made it to a certain spot. They didn't have phones, internet, etc.