The Castle can be visited
Highcliffe Castle

Highcliffe Castle, a mansion in Dorset, England, is considered a prominent example of early 19th-century Gothic Revival architecture. It is situated on a cliff, with views over Christchurch Bay.
History+
Around 1775, Lord Bute, a former British Prime Minister, had the first manor house built on the site. After his death in 1792, his fourth son, General Charles Stuart, inherited the estate but sold it in 1795. The original building was demolished and replaced by a new construction. Charles Stuart's son, Charles Stuart, 1st Baron Stuart de Rothesay, reacquired the estate around 1824. He had the existing manor house demolished and, from 1831, commissioned architect William Donthorne to build the current castle, incorporating his own ideas. Donthorne, a student of Jeffry Wyatville, was inspired by Fonthill Abbey. After Stuart's death, his childless daughter Charlotte, Countess Canning, inherited the estate. Later, in 1893, it passed to her distant cousin Edward Montagu-Stuart-Wortley. He occasionally leased Highcliffe, including to Kaiser Wilhelm II, who vacationed there in 1907.
Source: Wikipedia · Licence: CC BY-SA 4.0 · Image: http://en.wikipedia.org/wiki/File:Highcliffe_Castle_1.jpg
This description draws on the facts documented in the linked Wikipedia article; Wikipedia content is licensed under CC BY-SA 4.0. Wording and editing: Mobile History.
Location: 50.7379, -1.7142