Instagram hashtag data was analysed to discover the most popular filming locations from the Netflix show.
Hampton Court Palace and Chiswick House came second and third, with 181,786 and 45,633 hashtags respectively.
Locations manager Tony Hood described Hampton Court as ‘very square, very neat, [and] very Regency’.
Painshill Park in Cobham also came sixth, with 20,002 hashtags, as it served as the backdrop for picnics and promenade in series 1.