The Red Pyramid and the Bent Pyramid are less crowded as you see from the parking lot below... Also you can take a camera inside the Red Pyramid...but not inside the Great Pyramid at Giza...unless its small and you hide it well...there is a ticket taker who will inquire if you have a camera...if you do carry a camera openly... you will be required to leave it on a shelf with the ticket taker who will watch it for you until you climb out of the Pyramid...
