20. Ýdhra, Greece
With its ravishing horseshoe-shaped harbour and pine-clad interior, Ýdhra
(Hydra) is the archetypal Greek-island retreat, within easy reach of Athens. A lack of sandy beaches keeps the tourist hordes away but the sublime pebbly bays, sheltering clear emerald water, are one of the joys of a Ýdhra holiday. That, and the peace and quiet: cars, and even bikes, are banned, and donkeys are used to heave visitors’ luggage up the steep lanes.