Centuries ago lake-builders of Trebon employed ingenious techniques to transform flooding marshland into a clever combination of lakes, oak-lined dikes, and peat bogs. Today those peat bogs supply Trebon's other claim to fame: its peat spa. Soaking in the black, smelly peat sludge is thought to cure aching joints and spines. 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.