This is a favourite of mine...it falls into the category of allowing ones mind to drift over the possibilities when people first began to build with stone monuments in the landscape..
Making a place in space.....

S.P.A.C.E.S (Strumble-Preseli Ancient Communities and Environment Study

http://www.landscape-perception.com/art_and_archaeology/

Edit; There it was the morning and its vanished this afternoon ;)