I love Harewod House just out of Leeds. The series Victoria was filmed there and the costumes are on display at the moment. It has also has a great art collection .

Trouble is Harewood house was paid for out of the profits from the slave trade and the compensation provided when the Brits stopped the slave trade. I just have a few issues suggesting people visit such an establishment, also it is way-pricy and a bit tatty. But the grounds are ok.