El Castillo del Principe - Credit: Wikimedia Commons
The Castillo del Príncipe (Castle of the Prince) is a military fort located in the Loma de Aróstegui, in Havana, Cuba. In 1982, the fort was inscribed on the UNESCO World Heritage List, along with other historic sites in Old Havana, because of the city's importance in the European conquest of the New World, its fortifications, and its unique architecture. Read more on Wikipedia
Source: en.wikipedia.org