The largest lot on the Loop Road serves four trailheads: Door, Window, Notch and Castle. The Window Trail is a full boardwalk to a railed view of an eroded canyon, and the Door Trail passes through a break in the Wall onto open badlands marked by yellow posts. The Notch Trail, with its log ladder and ledge, is the park's most popular and its most injury-prone, and its status should be checked before planning on it. The Castle Trail, the longest in the park, heads west from here across fairly level ground. Restrooms and exhibits are at the lot. Visitors who walk beyond the boardwalks need closed-toe shoes, and they should stay well back from drop-offs. Look for clastic dikes in the walls, the vertical sheets of rock that geologists are still working out.
Door and Window is next. The long lot's on your right, two ways in, with restrooms. If the sound goes off with the engine, tap play. Here's how I'd spend it. The Window is the quick one, a quarter mile round trip on boardwalk to a natural window in the Wall. The Door is three quarters of a mile. It starts on boardwalk through a break in the Wall. Then yellow posts take you on at your own risk. The Castle Trail is ten miles round trip, so save it. Check before you count on the Notch. Wear real shoes, because falls are the top injury out here. Rattlesnakes like the shade under boardwalks. You can walk off trail, but formations are easier to climb up than down. Stay off the buttes. In twenty fifteen five hikers left the Door Trail and climbed one to pose for a photo. The hard surface gave way, and all five were hurt. Out there, look for thin tan sheets of rock standing on edge across the flat layers. Those clastic dikes hold ridges up like tentpoles, and one holds the Door itself in place. Nobody has fully explained them, so you might see what the geologists missed. Stay near the car if you've parked. Give it a minute and Boone picks up by himself, about three minutes.
Photo: Runner1928, Wikimedia Commons, CC BY-SA 4.0 · CC BY-SA 4.0