In reply to Crystal Rainbow.
The remains of Sandal Castle are hard by and it has mention of the battle of Wakefield, on the display boards, and the Castle itself (well what is left of it) are well worth visiting, I have been a couple of times, and it is always quite popular.
I see there is a new visitor centre, which just shows how long it is since I visited. www.wakefield.gov.uk: Visitor information
There is an offical website but it appears to not respond at present.