Former roadside zoo (Route 66)

The remains of the mountain lion (puma) cages at the old Route 66 roadside attraction known as Two Guns in Arizona. It is located off Interstate 40 (which replaced adjacent Route 66) between Flagstaff and Winslow. The front of the top building (opposite side of this photo) still has "Mountain Lions" painted on it and is easily seen from the freeway.

I posted a photo of the front here: Former roadside zoo (Route 66) | ZooChat

You can read a brief description of Two Guns here: Two Guns, Arizona - Death By Highway

Do you have any idea when the last time this zoo was operating was?

According to Wikipedia, the original zoo closed sometime prior to 1950 but a new zoo was added in the late 1960's. In 1971 the gas station burned down and the site began a rapid decline, leading to its current abandoned state.
Two Guns, Arizona - Wikipedia

Here is another, bit more in-depth article, though it states much of the same information.
Two Guns – Death By Highway – Legends of America