Summer's on the way, allegedly, but that doesn't mean the continent's loftiest peaks are off limits. When the sun shines and the snow melts, a whole world of opportunities open up on the top deck. Hiking, climbing, cycling and yodelling are all on the summer agenda. From the Dolomites to the Alps and the Pyrenees to the Mournes, send us your tips on where to stay, eat, walk and breathe the mountain air across Europe's roof gardens.