The first thing we see as we approach the town, is an Almohad tower that bore for almost two hundred years the standard of the Templar Knights. The city centre has numerous interesting monuments, such as the castle and church of the Templar Knigths, from the 13th and 14th centuries; the Renaissance church of Asunción, from the 16th century; the old City Hall, a medieval building with a 16th-century main front; and the Gothic church of Nuestra Señora del Mayor Dolor, from the 13th and 15th centuries, the oldest in Aracena. However, the most interesting of all is the grotto of Maravillas, with beautiful stalactites and stalagmites, which at 1,500 metres is one of the longest caves in Spain. Inside the grotto we find twelve halls and six lakes.