The Cagsawa Ruins, sometimes spelled as Kagsawa, are remnants of a historic Franciscan church from 16 century that is located in the Barangay Busay of the Municipality of Daraga in the Bicol Region, within the Republic of the Philippines.It was originally built in the town of Cagsawa in 1587 but was burned down and destroyed by Dutch pirates in 1636. It was rebuilt in 1724 by Fr. Francisco Blanco, but was destroyed again, along with the town of Cagsawa, on February 1, 1814, during the eruption of the Mayon Volcano.The ruins of the Cagsawa church now stands as the site of the Cagsawa Ruins Park, one of the most popular tourist destinations in Albay. It is also the site of the Cagsawa Branch of the National Museum of the Philippines, also known as the Cagsawa National Museum. The museum was established on land that was donated by the municipality of Daraga to the National Museum on January 26, 1981.
It was formally inaugurated on October 30, 1992 and is the third largest regional branch of the National Museum. It houses a collection of photographs of the volcanic eruptions of Mount Mayon as well as various geological and archeological exhibits.