FILE - In this May 26, 2010 file photo, Collette Royer, of Cambridge, Mass., left, sits on the edge of Walden Pond, in Concord, Mass., with her parents Harvey, center, and Floyce Royer, right, both of Fallbrook, Calif. The simple, serene place that inspired Henry David Thoreau's work the most is going solar. Officials are building a new visitor's center at Walden Pond State Reservation featuring a solar canopy and two electric vehicle charging stations. (AP Photo/Steven Senne, File)