Castle of Solterra Monument · Sant Hilari Sacalm, Selva, Girona Solterra castle, documented since the year 929 and militarily active until the 15th century, held directly by the counts of Barcelona, retains barely any remains beyond the circular base of its tower and a chapel dedicated to Saint Michael, which stood until around 1910. A Bien de Interés Cultural (Spain's highest level of heritage protection) (BIC RI-51-0006076). Photo: Pere López (CC BY-SA 3.0) What to see and do in Sant Hilari Sacalm