Yes - Antelope Canyon is probably the most famous slot canyon. It is just outside of Page and really cool. Not really long or really deep, but the sun lights up the walls differently throughout the day so you never see it the same way twice. It is on an Indian Reservation and they charge you a lot of money IMO to see it and they don't let you stay there too long. That is why I like Buckskin Gulch - less touristy, you can explore it on your own schedule, and it is only a $5 Day Use Fee.