Thanks! There are two Antelope slot canyons: Upper and Lower. Upper is more popular (the photographs you see with light beams going from the top of the ceiling to the ground are from Upper antelope). For photographers, Upper requires paying a tour operator (something like $50 for two hours if I recall), but you're going to be mixed in with all the other tourists, and it's difficult to get shots without them in your frame or with enough time to compose something good with good light. Lower Antelope (which is where this photo is taken) on the other hand you just hand over $26 and they leave you alone for 2 hours. It's not as popular as Upper - some days there will be some other photographers and some days there won't be. After the 2 hours you can return and pay for another 2 hours.