Established by the Romans in 179 A.D, Regensburg has bowed into a flourishing trading and cultural hub, but its old town bears so many beautiful marks of wealthy history that UNESCO decided to differentiate it with World Heritage honors. And certainly, a walk through old Regensburg is a sensory experience of German optimism and creativity. Unharmed by wars and luminously sealed, it's more of an open-air museum than urban center. Among its aristocratic houses and towers, myriad churches and Spartan ensembles, one is bound to go aboard on a voyage back to the Middle Ages. Its melodious exterior, energetic with appealing medieval sculptures, has of late been fully cleaned. Inside are even more sculptures along with a widespread collection of medieval tainted glass.