Showcasing almost 500 years of history, the streets of Old San Juan (San Juan Viejo) are windows to the past, with historic forts and Spanish colonial architecture setting the scene. This World Cultural Heritage Site is the second oldest city in the Americas and the oldest city under the US flag. The seven-square-block area contains more than 400 beautifully restored 16th- and 17th-century colonial buildings, many of which contain shops, restaurants, museums, hotels, and other public buildings. The most dramatic feature, and the real showpiece of Old San Juan is the Fuerte San Felipe del Morro, known more commonly as El Morro, set out on a point of land overlooking the sea in the San Juan National Historic Site. Experience the city's real charm by simply wandering the streets, admiring the old architecture, and enjoying a meal on an outdoor patio. Other highlights are Fortaleza, the San Juan Cathedral, and Castillo de San Cristóbal. As you stroll, be sure to pop into some of the museums, many of which are worth stepping into just to appreciate the architecture of the structure housing the collections. This whole area can be explored on foot, although the walk out to El Morro fort adds considerably more to the length of a walking tour.