The remains of 300 small 13th-century Sinagua cliff dwellings can be seen in the undercut layers of limestone in this 400-foot-deep wooded canyon east of Flagstaff. These cliff dwellings, though not nearly as impressive as the ruins at Montezuma Castle National Monument (50 miles to the south) or Wupatki National Monument (20 miles to the north), are worth a visit for the chance to poke around inside the well-preserved rooms, which were well protected from the elements (and from enemies). The Sinagua were the same people who built and then abandoned the stone pueblos in Wupatki National Monument, and it is theorized that when the land to the north lost its fertility, the Sinagua began migrating southward, settling for 150 years in Walnut Canyon.

A self-guided trail leads from the visitor center on the canyon rim down 185 feet to a section of the canyon wall where 25 cliff dwellings can be viewed up close (some can even be entered). Bring binoculars so that you can scan the canyon walls for other cliff dwellings. From Memorial Day to Labor Day twice a month, on the first and last Saturday, there are guided hikes into the monument's backcountry (reservations required). There's also a picnic area near the visitor center.