At Pueblo del Arroyo, there is a trailhead for the "Alto Mesa Trail". You must get a permit to hike this trail and keep a copy of it
with you at all times. The trail is not hard or dangerous, but rules are rules, so we registered at the Visitor's Center.
The trail takes you up the side of the cliff via a natural split between
the cliff and a large wall-rock. Once on the top, you walk along a mesa for several miles. There are two sets of ruins up there: Pueblo
Alto and New Alto. There's also a very interesting map placed there by the Park Service which shows how the road (The "Chaco
Highway") forked at this point and went on to Nevada, Utah, and Colorado.
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