I've driven past the Two Guns exit between Flagstaff and Winslow for 35 years, always wondering about the "ruins". Today was the right time to go exploring.
The abandoned buildings of this ghost town have a rich history and some internet searching will give the details of the area. The old zoo buildings are almost 100 years old; the Route 66 connection is seen with the old bridge. I didn't make it to the Death Cave and don't know if it is even accessible now.
A passenger car can make it down the dirt roads to the various ruins/abandoned buildings.