Palacio de congresos y auditorio Kursaal Monument · Donostia/San Sebastián, Donostialdea, Gipuzkoa Building by the architect Rafael Moneo, opened in 1999, made up of two translucent cubic volumes housing an 1,800-seat auditorium and conference halls. 1999 Photo: Jorge Franganillo (CC BY 2.0) What to see and do in Donostia/San Sebastián