The Old City Of Jerusalem
Mark Williamson/science Photo Library
Tower Of Winds #3
David Parker/science Photo Library
Phasael Tower
Science Photo Library
Tower Of Winds
David Parker/science Photo Library
Tower Of Winds #1
David Parker/science Photo Library
Tower Of Winds #2
David Parker/science Photo Library
Leaning Tower Of Pisa Repairs
David Nunuk/science Photo Library
Boreas
David Parker/science Photo Library
Theatre Of New Pleuron
David Parker/science Photo Library
Facade Of The Temple Of Hadrian
David Parker
Ruins Of The Temple Of Athene
David Parker
Lighthouse And Approaching Sailing Ship.
David Parker/science Photo Library
Concentrating Solar Power Plant
David Hicks/nrel/us Department Of Energy
Concentrating Solar Power Plant #2
David Hicks/nrel/us Department Of Energy
Leaning Tower Of Pisa Repairs
David Nunuk
Naca Aeronautics Committee
Library Of Congress
Hell Gate Bridge Engineers
Library Of Congress/science Photo Library
Walls Of Jerusalem Old City
Mark Williamson/science Photo Library
Curvature Of The Surface Of The Sea
David Parker
Top Of The Tower Of The Mcmath Solar Telescope
David Parker