St. Martin's, Canterbury, is reputed to be the oldest parish church in England. Although much of the church dates to the 14th century, the fabric incorporates Roman bricks, suggesting a Roman-era church may have stood on the same site. The chancel dates the the 7th century, and the baptismal font is reputed to be the font at which King Æthelbehrt was baptized by St. Augustine.
The church, along with Canterbury Cathedral and the ruins of St. Augustin's Abbey, are a UNESCO World Heritage Site.
Historic England. Church of St. Martin (1242166). National Heritage List for England.
Image credit: "St Martin church Canterbury rear" by Adam Bishop - Own work. Licensed under CC BY-SA 3.0 via Wikimedia Commons.