Bamford Haybarn Spa, The Berkeley Hotel, London, the-berkeley.co.uk
The historic Berkeley Hotel in Knightsbridge boasts one of London’s few rooftop pools and has just added a posh spa right beneath it. The 6,000-square-foot space is minimal-chic; treatments balance indulgence with an eco angle, employing Bamford’s much celebrated organic skincare line. Book an overnight stay in a “king balcony room,” which features an English garden–themed outdoor space. With latticework and boxwood hedges, it’s private enough to allow for an alfresco massage—English weather permitting, of course.