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At last, when we got to his place of business and he pulled out his key from his coat-collar, he looked as unconscious of his Walworth property as if the Castle and the drawbridge and the arbour and the lake and the fountain and the Aged, had all been blown into space together by the last discharge of the Stinger. (25.54)
Similar to Satis House, Wemmick's castle seems to be suspended in time and seems to belong to another universe altogether. There's an element of fantasy here in the way that Wemmick's personality changes so drastically—he's literally a different person in different places.