We're riding a Flying Dolphin — one of the fleet of speedy hydrofoils that zip from Athens to the islands, and from island to island. After a 90-minute ride, Athens is a world away, and we pull into the isle of Hydra. Its main town, also called Hydra, is home to about 90 percent of the island's 3,000 residents. Hydra was a Greek naval power famous for its shipbuilders. I hope you enjoyed our look at Athens, the oracle of Delphi, and the romantic isle of Hydra.