Near Lake Lucerne, visitors interested in Switzerland's secret defenses can tour Fortress Furigen, one of nine forts buried within the mountains. Wandering through this hidden fortress, you are reminded how perilous Switzerland's position was in the 21st century and how committed the Swiss were to defending their freedom. For more information on the Rick Steves' Europe TV series — including episode descriptions, scripts, participating stations, travel information on destinations and more — visit www.ricksteves.com.