adams county
adena culture
aerial view of the coiled tail part of serpent mound
ancient monuments of the mississippi valley
astrobleme
ceremonial mound
coiled tail part of serpent mound
effigy
equinox
indigenous cultures
largest serpent effigy in the world
mounds in america
native american
ohio
ohio history
ohio mounds
prehistoric
sacred circles earthworks
serpent mound
serpent mound museum
spiral mound