The largest plaza in Valencia is the Plaza del Ayuntamiento; it is home to the City Hall (Ayuntamiento) on its western side and the central post office (Edificio de Correos) on its eastern side, a cinema that shows classic movies, and many restaurants and bars. The plaza is triangular in shape, with a large cement lot at the southern end, normally surrounded by flower vendors. It serves as ground zero <answer>during the Les Falles</answer> when the fireworks of the Mascletà can be heard every afternoon. There is a large fountain at the northern end.
When are firewords heard every day?
during the Les Falles