Photo and caption by Nathan Eaton Jr

Ahu - the Hawaiian term for cairns, stones stacked into an often-conical shape - are a common sight around the Big Island. Created by both locals and tourists, they're often found marking trails or in places having an abundance of stones, whether rounded such as these or rough chunks of lava. We found these along the shore of Kealakekua Bay, located in the Kona District on the western shore of the Big Island. Across the bay is the monument to Captain James Cook.

Location: Kealakekua Bay, Hawaii