Trinitate Plaza is located in the heart of the medieval old city of San Sebastian. Many events and festivals are held in this square, especially in the summer, in addition to various cultural events such as "Gazzadilla", which is very popular among the residents of the region. It is worth mentioning that the architect Luis Luis Peña Ganchegui designed the square in 1963 to celebrate the centenary of the demolition of the city walls.