Which is the World's Best Watery Paradise? Perivolas On the Greek island of Santorini, a cluster of private homes rests along the 300-year-old cliffside ruins of an indigenous community. What were once cave dwellings, stables and wineries are now 17 luxury villas -- and the gem that sits between them is this infinity pool that appears to drop straight into the Aegean below. William Abranowicz/Perivolas Santorini