The town of Buitrago del Lozoya is completely surrounded by an ancient wall originally built by the Moorish people. Within these walls lies the ruins of the Buitrago de Lozoya castle. The style of the castle is a unique mix of Mudéjar (moorish) and Gothic designs – tall, solid square towers combined with the typical pentagonal shaped often used by the ancient Arabs. It was built in the 15th century. It has a rectangular plan, with seven towers of various shapes (round, pentagonal, square), all in stone. The interior is in ruins.
References:House of the Blackheads (Melngalvju nams) is a building situated in the old town of Riga. The original building was erected during the first third of the 14th century for the Brotherhood of Blackheads, a guild for unmarried German merchants in Riga. Major works were done in the years 1580 and 1886, adding most of the ornaments.
The structure was bombed to a ruin by the Germans June 28, 1941 and the remains demolished by the Soviets in 1948. The current reconstruction was erected from 1995 to 1999. Today the House of Blackheads serves as a museum and sometimes concert hall.