The port and town of Hydra (or Idhra) island has a view of greystone mansions and little white houses that are climbed up to a horsoe harbour. You are going to visit Hydra with your sailing boat because it is one of the most famous yacht charter islands in Greece, and unfortunately one of the most packed at the high seasons.
Hydra is treated as a national monument, because of her architecture. The mansions (ta arhontika) of the merchant families, designed by Venetian and Genoese architects that was living that period at the island.
There are no cars and it is free of traffic. Donkeys are the only way of transport around the island roads.