Goldusan Martyrs' Mausoleum is a Catholic shrine on the Han River dedicated to those who lost their lives during the Pyeongin Persecution of 1866. In late 1866, nine French missionaries were martyred. This caused two attempts to invade a French fleet in Korea. After the invasion attempts, the Joseon government punished, targeted and brutally killed many. Of the original French and Korean Roman Catholics, the place became known as "Beheading Mountain." In 1962, a memorial was erected in honor of those executed here, and in 1967, a church and museum were built in honor of the centenary of persecution.