Wentworth is the largest private home in the UK and the longest fronted country home in Europe. The gardens were ruined due to open cast mining by the Labour government after the 2nd world war. Wentworth Woodhouse has gone through some hard times and has recently been purchased and will be further restored.
Buckingham palace is a poor 2nd to Wentworth Woodhouse, I understand that two Prime ministers were born here.
You can find out more here. en.wikipedia.org/wiki/Wentworth_Woodhouse
All the best