Södertuna Castle

"If you don’t mind heading some way beyond the centre, there’s a perfect one-night stay in the town of Gnesta, home to an outstanding spa. It is called Södertuna Slott – which means Södertuna castle – set as it is in an old castle on the banks of Lake Frösjön, deep in the countryside. Wellbeing here means rustic hikes, canoeing and cycle rides as well as nourishing cooking perfected by first-rate chefs using local ingredients. (You might add a bottle of wine from the cellar.) All this is just under two hours by train from Central Stockholm. The spa majors in excellent facials and full-body treatments that’ll have you soft as putty for your return to the city."