673a Visiting Antarctica; The Journeys of Trees; Italy's Northern Lakes

A travel writer shares how a trip to Antarctica helped him see that continent through the eyes of the early polar explorers. Then a reporter focused on climate change and conservation explains how some North American tree species are migrating to survive the planet's rising temperatures. And two Italy-based tour guides take us to the resort lakes of northern Italy, where the glamour extends beyond the natural scenery. For more information on Travel with Rick Steves - including episode descriptions, program archives and related details - visit www.ricksteves.com.