The t-shaped entrances observed at Montezuma Castle suggest that ideas, in addition to pottery and tools, were traded between the Sinagua culture of the Verde Valley and the Ancestral Pueblo culture of the four-corners region.
The contrast of the two color of mortar colors is evident in this photograph. The red/darker morter on the bottom two thirds was applied by the NPS in the late 90's. The white/lighter morter on the top third was applied by the Sinagua over 700 years ago.
The small cave that is in the cliff wall would have been behind seven rooms! The rubble on the hill in front of the cave show archeologists where the rooms might have stood, using the cliff wall as the back wall of the small pueblo.