Recently I biked to Someries Castle. It's made of brick, which is a bit unusual (at least in my book), and all that's left are the ruins of the gatehouse and the adjoining chapel. It's thought that the rest of the brick was used to build the farm buildings in the area. Indeed, the ones I saw nearby are made of brick. It's also thought that it wasn't really a castle, but a fortified manor house. Here's the sign:

Video of Someries Castle
As you can see, it's surrounded by a farm.