Remember the old quip that dancer Ginger Rogers could do everything Fred Rogers could do — and do it backwards in heels? That’s also true of people who create bridges, roads and buildings in rugged mountain terrain as opposed to the flatlands. There’s no better example than the Keystone area. As you arrive from the north, watch for the laminated timber-arch highway interchange, the only one of its kind in the world. The three-level bridge is an architectural marvel. As you descend the canyon, you’ll pass under Miner’s Tunnel, one of seven stone underpasses in the area. As you explore the town, note the unusual stone retaining walls and foundations.