When a theme park shutters its gates for good, it’s usually marked with a small sigh from the local news or, if the park was big enough, a what-went-wrong exposé from the national press. Decades later, they’re rusted-over playgrounds for teens who want to spook their dates.

One YouTuber, who runs the channel Defunctland, is working to make sure that the legacies of big-ticket entertainment ventures aren’t lost to time.