Five of the best sustainable holidays across Europe

From a spa-and-cycling trail across Slovenia to the coolest energy-saving hotels in Berlin, these getaways tick all the eco boxes

This summer the country’s tourist board launched a new Green Wellness cycling route. A looping cycle trail of nearly 200 miles linking natural spas, it starts in Ljubljana and heads north towards the Austrian border and then south-west towards Croatia, winding through mountains, plains and vineyards. There’s a castle on an island, a beer fountain and miles of wild flowers. The first leg ends in medieval Kamnik, a red-roofed town of castles and monasteries with a view of the mountains, Slovenia’s biggest arboretum (sporting 2m tulips in April) and the Terme Snovik spa in the forested Tuhinj valley.