It is one of the oldest cities in the country and was the seat of power for most of the colonial rules of the Philippines. It is situated on the eastern shore of Manila Bay and contains a multitude of landmarks, some of which date back to the 16th century. It is home to the baroque 16th-century San Agustin Church as well as Fort Santiago, a storied citadel and military prison. In the 19th century Manila became one of the most modern cities in Asia. Before the Spanish–American War, Manila saw the rise of the Philippine Revolution. Under the American rule following the Spanish-American War, the United States changed the official language from Spanish to English. Towards the end of World War II, during the Battle of Manila, most of the city was flattened by intensive aerial bombardment. Today, tourism is a vital industry in Manila. Major shopping malls and bazaars thrive around Manila.