Often overlooked by visitors, Cologne is a fascinating city just waiting to be explored. Discover more than 80 unusual locations with this explorer's guide to Germany's most historic city. Roman ruins and religious relics, forgotten fortresses and abandoned cemeteries, industrial relics and historic hotels. Where did the Red Baron learn to fly? Is there really a chandelier in the sewers? Where is Europe's first art hotel? Descend into the city's crypts, marvel at the cathedral's curiosities, smell the city's famous perfume, and more.