Tower of the Bones - Credit: Wikimedia Commons
Tower of the Bones - Credit: Wikimedia Commons
The Tower of Bones is an Islamic watchtower, the remains of which are exhibited in the underground parking structure in the Plaza de Oriente, in the Spanish city of Madrid. It was built in the 11th century by the Muslim population that founded the Mayrit fortress two centuries earlier, as an integral part of its defensive system. Read more on Wikipedia
Source: en.wikipedia.org