The Burgkapelle (Royal Chapel) originally dates from the 13th century and received a Gothic makeover from 1447 to 1449, but much of this disappeared during the baroque fad. Its vaulted wooden statuary survived and is testament to those Gothic days. The Vienna Boys’ Choir Mass takes place here every Sunday at 9.15am between September and June. The chapel is sometimes closed to visitors in July and August, so check ahead in those months.