This massive complex in the Scottish city of Edinburgh is the largest climbing gym in Europe in terms of overall area. The arena features climbing routes for people of all ability levels. There is even a separate bouldering room with challenging problems for even the most advanced bouldering fanatics. The arena's tower route stands “only” 95 feet tall (that is still a forearm-burning undertaking for even the most in-shape climber), but the sheer number of routes and features inside this facility makes it an obvious choice for our list. Both the British Climbing Championships and the World Youth Climbing Championships have been held here, so Europe's and the world's best have scaled the Arena's walls. If you have no-climbing members in your party or if you want to relax after a morning of climbing, the on-site spa, large children's play area, cafe and ceramics studio provide plenty of opportunity for non-climbing fun.