Jaca is known as the "pearl of the Pyrenees". It is a cosmopolitan European city, and an important stop along the "Camino de Santiago", the Pilgrim's Road to Santiago de Compostela.
In Jaca we must visit the "Ciudadela" (citadel), a great example of 16th-century military architecture, which was declared a National Monument. Construction work for the citadel began in 1592. The building has a pentagonal floor-plan of huge dimensions, and is built on a flat surface. We find in Jaca many other remarkable buildings, such as the Romanesque cathedral (11th century), declared a National Monument; the monastery of the Benedictines; the church of Santiago; the hermitage of Sarsa; the bridge of San Miguel; the 15th-century Torre del Reloj (Clock Tower), and the City Hall.