Did Seaton Delaval Hall once have domes with needles on it's roof? and did this have another purpose

From looking the buildings which Sir John Vanbrugh designed, they all seem to display domes with needles, and therefore, is very likely that this was the same with Seaton Delaval Hall... 🔴👉🏻 https://youtu.be/eCNBZD7azeI
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