Tour a 19th-century Scottish Baronial castle and its grand gardens, tucked deep within Ireland’s largest and wildest national park. This oasis of medieval civility sits within the forested wonderland of Glenveagh National Park, a 40,000-acre expanse of mountains, lakes and glens – incredibly pristine and full of wildlife. Even the drive there from Derry is a scenic feast, across County Donegal and into the heart of the beautiful, sparsely populated Derryveagh Mountain region. As you enter the park, you might even catch sight of a herd of red deer, free-ranged here as they once did throughout Ireland. Celebrities once free-ranged on this estate too, as you’ll learn during your guided visit to Glenveagh Castle. This magnificent turreted mansion went up in 1873, built by a wealthy Irish landowner intent on eclipsing even famous Balmoral Castle’s grandeur. He certainly came close. In its later years as a private residence, Glenveagh hosted many glamourous guests, including Greta Garbo and Marilyn Monroe. At the end of your inside tour, you’ll have about an hour of free time to stroll the castle’s expansive gardens, which still retain their original Victorian layout protected by windbreaks of fragrant pines and rhododendrons. Don’t miss the Gothic Orangery.