The ancient architecture of Old San Juan represents four centuries of growth that molded the historic urban environment. With Gothic, Renaissance, and Baroque architecture, it is now the most complete Spanish urban center in the country. The old town was declared a National Historic Landmark in 1962. Old San Juan has six archbishops who ruled over the colonial territory. The current structure was built between 1695 and 1713 by Diego de Herrera, who also built the Cathedral on Correjo Street. His work combines European styles with local materials such as cedar and stone. The interior features beautiful hand-painted tiles made in Spain's Caribbean colonies. Old San Juan is surrounded by walls about one mile long that were originally built to protect the city from invasion by pirates but have served many other purposes over time. The walls now include several parks and playgrounds where people can relax or play sports. There are also several museums inside the walls that showcase Puerto Rican history and art. Outside the walls, you will find more modern buildings, some of which contain offices, shops, and restaurants. They all share the same sandy color due to the use of concrete for construction. A new type of building has been rising up in Old San Juan: luxury condos. These high-end residences offer the best views in the city and price tags to match!