In the Sierra Madre Occidental mountain range in Mexico, the highest bracing bridge in the world is being built. Its engineers work through constant meteorological dangers over a gully more than 1,300 feet deep. Once concluded, the Baluarte Bridge will unite the highways of Mexico's Pacific coast with those of the Atlantic, becoming a Panama Canal of the land. Learn more about this massive structure as Nat Geo goes inside the construction of the Baluarte Bridge.
