The Battle of Manila in 1945 entirely flattened Intramuros. As the occupying Japanese Imperial Army made their last stand against the victorious efforts of Allied soldiers and Filipino guerrillas, heavy artillery bombing destroyed its eight churches, walls, universities, houses, and government buildings constructed for centuries in Spanish colonial architecture; only the San Agustín Church, the oldest standing church in the Philippines, survived the bombing of Manila intact and was later made a UNESCO World Heritage Site. Though reconstruction efforts began immediately after the war, many of its original landmarks are still lost today; under the Intramuros Administration, Intramuros is still in the process of postwar reconstruction and revival of its cultural heritage.