Since the late nineteenth century, Niagara Falls has been heavily engineered to generate energy behind a flowing facade designed to appeal to tourists. Fixing Niagara Falls reveals the technological feats and cross-border politics that facilitated the transformation of one of the most important natural sites in North America. Daniel Macfarlane shows how this natural wonder is essentially a tap: huge tunnels around the reconfigured Falls channel the waters of the Niagara River, which ebb and flow according to the tourism calendar. This book offers a unique interdisciplinary and transborder perspective on how the Niagara landscape embodies the power of technology and nature.