If your idea of recharging includes crisp air, mountain views and water, the Lakes of Covadonga in Asturias, Spain are ready to reboot your mood. Set inside Picos de Europa National Park, the glacial duo—Enol and Ercina—prove that nature doesn't need editing software. Enol is the deeper, larger lake, calm enough to mirror the surrounding peaks. Ercina sits slightly higher, shallower and usually accompanied by Asturian cows. Both rest at around 1,000 metres, shaped long ago by slowly retreating glaciers.

The climb up from the Covadonga Sanctuary is scenic. During busy months, private cars are restricted while shuttle buses handle the ascent. At the top, simple trails loop around the lakes and cut through meadows and old mining huts. Wildlife watchers get free entertainment: vultures above, choughs on the rocks, cows everywhere else. Pair the visit with local cider afterwards, and you've unlocked peak Asturias.