638 Sailing in Oslo; Underland; Beyond Amsterdam Travel with Rick Steves

There's a largely unknown world to explore, right beneath your feet. Author Robert Macfarlane tells us what he finds intriguing about the "Underland." Plus, hop aboard for a sail to Oslo. And Dutch tour guides help us plan a trip to the Netherlands, where they recommend Haarlem, cycling to the sea, and other attractions beyond the usual sights in Amsterdam.