Near the central port, the landmark Poseidonion is widely photographed, with its unique French Colonial architecture. Built by Spetses benefactor Sotirios Anargyros between 1911 and 1914, it was one of the first establishments to accommodate foreign and Greek guests and dignitaries at a time when tourism was practically unknown here. Guests and diners gather on the veranda for evening meals in front of Poseidonion Square, where Spetsiots and visitors converge at dusk. Reopened in 2009 after a four-year renovation, it includes a spa (hamam/steam room and indoor pool), a restaurant, and a brasserie. Rooms in the newer building are more spacious, but we like the Belle Epoque élan of those in the original building. All are elegantly appointed. Kudos, too, to the staff who are warm and extremely efficient. Open March through October only.