citadel and palace, the al-Qaṣaba al-Qadīma ("Old Citadel"), was located on the top of this hill. During the Nasrid period, the citadel was moved to the Alhambra and the old district became known as (), from which its present name derives. Among the various Nasrid-period houses and other structures, one notable establishment was the Maristan, a type of historic hospital (bimaristan) which also took care of the mentally ill. Through the course of the 16th century, after the surrender of Granada to the Catholic Monarchs in 1492, the district underwent some of the some changes that occurred throughout the city. Mosques were replaced with new parish churches, particularly after 1501. These new churches were often built in a mix of Mudéjar and Renaissance styles, such as the Church of Santa Ana, the Church of San Cristóbal, and the Church of San Miguel Bajo, among others. Some, like the churches of El Salvador, San José, and San Juan de los Reyes, preserve parts of former mosques. New civic institutions were also built in this area, such as the Royal Chancellery (Real Chancillería), which overlooks Plaza Nueva, a wide public square expanded during the 16th century. During the 16th century the most of the city's morisco population was concentrated in the Albaicín, but after the 1568 rebellion and their subsequent expulsion, the district was depopulated. As a result, many of the remaining Christian residents expanded their residences to form carmens, traditional semi-rural houses with gardens or orchards, many examples of which survive today. Some of these houses and mansions, such as Casa de Zafra and the Dar al-Horra, date back to the Nasrid period. In 1994 the UNESCO World Heritage Site encompassing the Alhambra was extended to incorporate the Albaicín as well. In addition to its historic houses and mansions, churches, and the Royal Chancellery, the district also preserves sections of the 11th-century Zirid city walls (part of the former Zirid citadel), the 14th-century Nasrid walls, the Bañuelo (a former Islamic-era bathhouse), and numerous cisterns from the Islamic period that were part of a water supply system providing water to most of the city's houses. Sacromonte The Sacromonte neighbourhood is located on the Valparaíso hill, one of several hills that make up Granada. This neighborhood is known as the old neighbourhood of the Romani, who settled in Granada after the conquest of the city. It is one of the most picturesque neighborhoods,