Off Topic — HabitableZone

Off Topic » in reply to Good heavens, girl. What ARE you talking about?

Here's another kind of mysterious circle

Ténéré desert, Niger, 1997

Photograph by George Steinmetz

"Stark circle of rock measuring about 60 feet [18 meters] in diameter likes in the Ténéré desert below the massif of Adrar Madet in Niger. Roughly a mile away in each of the four cardinal directions, similarly crafted arrows point away from the circle, whose origin, purpose, and age remain a puzzle."

(Text and photograph from "Journey to the Heart of the Sahara," March 1999, National Geographic magazine)

http://lava.nationalgeographic.com/cgi-bin/pod/PhotoOfTheDay.cgi?month=06&day=19&year=06

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