St. Severus is the main and largest church in Boppard. It is a 12th to 13th century building which is located off the market square. It features two tall towers, topped by black spires. Inside, you can find remains of an older church on the site. There is a baptismal font from the 5th century, and a pulpit from the former church. Also inside are a collection of impressive colourful wall paintings. The Triumphal Cross is also incredibly old, yet well preserved. The church is still in use and welcomes visitors to look around.