Incredibly, the Multangular Tower in York - part of the city's Roman walls - was built in the third century. Here are 12 of the oldest castles, abbeys and churches in our historic county.
1. Multangular Tower, York - third century AD
2. St Wilfrid's Crypt, Ripon Cathedral - 672 AD
3. All Saints Church, Ledsham - 8th century AD
4. All Hallows Church, Bardsey - 825 AD