This is an excellent well written book that takes you behind the creations of such engineering wonders as the Hoover Dam and the Transcontinental Railroad. Deborah Cadbury also brings into account some little regarded engineering feats such as the London Sewers and the Bell Rock Lighthouse. The book is well-written and easily understandable without a Ph.D. in Engineering. Cadbury reveals the mysteries, mistakes, and human cost of seven great engineering wonders of our world.