I think it's actually the Sage & John Cowles Convervatory, which is adjacent to the sculpture garden.Walker Art Center Sculpture Garden, Minneapolis, MN?Now that was a lucky guess although something about the headress and facial design seemed to ring the right bell. Ok, I'll offer up another:
I love google
http://www.minneapolisparks.org/default.asp?PageID=4&parkid=499
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http://453c.smugmug.com/