The interior walls of Hercules have multiple terraces, and there is a small outer rampart.

The crater floor has been flooded by lava in the past, and contains several areas of low albedo.

The satellite crater Hercules G is located prominently just to the south of the center.

[2] In the past this crater has been reported as the site of some transient lunar phenomenon.

By convention these features are identified on lunar maps by placing the letter on the side of the crater midpoint that is closest to Hercules.