Looking out from northern cliffside of Santorini, a dense cascade of pristine white-washed houses, terraced luxury suites, and winding pathways clings dramatically to the dark volcanic rock face. Down below on the calm waters of the Aegean Sea, a scattered fleet of catamarans and sailboats drift gently to catch the final rays of the day, while the low silhouette of Thirasia island lines the horizon on the left.