There really is no other place quite like Civita di Bagnoregio. Accessible solely by a quarter-mile long footbridge, this remote little commune is perched atop an island of volcanic tufa, amid the windswept canyons of the Tiber River valley. Founded by the Etruscans in the 5th century BCE, Civita thrived for hundreds of years before it began to literally crumble in the 16th century. The sliver of earth that once connected Civita to neighboring village Bagnoregio eventually eroded away, isolating…