Only about 0.2 miles north of the old trading post, a large boulder is the foundation of a ruins site, and has an extensive petroglyph panel.
Not all the rock art is ancient. The JW initials look like the work of John Wetherill, one of the famous brothers associated with Mesa Verde and other Four Corners ruins sites.
There was a locked gate in the farm area and it didn't appear that any road or trail continued further up the canyons. This area is near the junction of Yellow Jacket Canyon coming from the east and Hovenweep Canyon from the north.
Canyons of the Ancients National Monument is a large area with a high concentration of Ancestral Pueblo ruins sites but it doesn't have many official trails and there aren't very many easy to find access points. It is a discover things on your own park.
(On a later visit I noticed a cow trail that leads to the top of Cannonball Mesa about 1.4 miles northeast along the rough dirt road. Following the cow trail, there are good hikes up above that I call Cannonball Cliffs and Cannonball Point. There are at least four other ruins sites to find in this immediate area. There is also a small site on the west side of the Yellow Jacket Creek. Use the labels for more on these hikes.)