This is not only the oldest surviving church in the country, but it was pretty much the only building still standing in Intramuros after the U.S. bombed Manila in 1945 to drive out Japanese forces (it was spared because it was being used as the Red Cross headquarters). The baroque interior includes a trompe-l'oeil ceiling painted in 1875 by Italian artists. The ticket price includes access to an interesting little museum. Look for the Chinese lions (known as Fu lions) guarding the entrance to the church.