Interlaken, one of the Alps' original resorts, is a useful springboard for alpine thrills. And, when the famous peaks get socked in by clouds, you can choose from some interesting lowland options. In this town, four innocent-looking hay barns conceal a network of tunnels connecting several big guns. Many of these once top-secret sites are now open to the public as museums. #ricksteveseurope #switzerland #jungfrau

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Rick Steves, America's most respected authority on European travel, writes European travel guidebooks, and hosts travel shows on public television and public radio.