Slieve Donard Resport & Spa in Newcastle, Northern Ireland

Nestled at the foot of the Mountains of Mourne, this luxury hotel boasts all the amenities you’d expect in a five-star hotel, such as gorgeous rooms and excellent dining, plus a few you probably wouldn’t—an electric car charging point, an on-site food waste processing plant, and a wood pellet boiler to power the world class spa facilities.

 Following an extensive £15 million renovation, the Victorian property is now one of the most environmentally-friendly hotels in Britain, receiving a Gold Award in the Green Tourism Business Scheme in 2015.