We'll explore the historical riches of Potsdam, Germany, and we'll hear how Athens, Greece has grown into a visitor-friendly destination, complete with a new Acropolis museum. We'll also get a dispatch from adventure cyclist Willie Weir from his favorite square in Madrid, and we'll open the phones for your nominations for a favorite city to explore.

For more information on Travel with Rick Steves - including episode descriptions, program archives and related details - visit www.ricksteves.com.