A Marvel of Inca Engineering
Ken Wright, a hydrologist and civil engineer, has been studying the waterworks and other engineering achievements of Machu Picchu since 1994. © 2009 NGHT, Inc. and WGBH Educational Foundation
Ken Wright, a hydrologist and civil engineer, has been studying the waterworks and other engineering achievements of Machu Picchu since 1994. © 2009 NGHT, Inc. and WGBH Educational Foundation