The Keet Seel Area is accessible either by foot or by horseback from headquarters via a difficult 17-mile round-trip trail, which is open Memorial Day through Labor Day. It contains the largest and best preserved of the cliff dwellings in the vicinity, which date from around 1250-1300. To protect these fragile ruins there is daily limit of 20 people on the number of hiking and horse trips permitted. This trip is not recommended for inexperienced hikers or riders. Primitive campgrounds are available for hikers. Check with rangers at the visitor center for reservations. Schedules for tours of the ruins vary. Reservations are required and they should be made within 2 months of the date of the trip and be confirmed 1 week prior. Pick up permit at 4 PM preceding day or 8:15 AM day of hike . Oct-May day hikes available (no overnight camping) call the visitor center.