Circle Mound, Mounds State Park. Constructed in approximately 1 CE, the entrance of Circle Mound is in alignment with the rising sun on both the fall and spring equinoxes. These photographs were taken facing the entrance of the mound on the 2012 fall equinox (top) and 2013 spring equinox (bottom) as the sunrise illuminates Circle Mound.

Photographer's Name: Eliot Reed
Photographer's City and State: Anderson, IN