The site previously housed a church built in 1791 and parts of that structure were incorporated into the present building, which boasts an impressive Gothic architectural style. Inside, visitors can view fine sculptures, a spectacular marble High Altar and more than 40 stained glass windows. The church is also famous for housing the shrine of St Oliver Plunkett, who is credited with bringing Jesuits to Drogheda. He was hanged for treason in 1681. Pope Paul VI declared him a saint in 1973, and his preserved head forms the centrepiece of the shrine.