Old Town’s Plaza de la Constitucion is the happeningest place in San Sebastian. Described as the city’s nerve center, draws people all the time, but especially on saints’ feast days and other holidays, such as the raising of the flag on January 20.

 Travelers should be on the lookout for numbers above windows facing the square. The square was once a popular bull-fighting venue; the numbers mark spectators’ seats.

 Built in 1817 after a fire nearly destroyed the city four years earlier, visitors can find shops and cafes where they can linger over a glass of wine.