Poznan is a city of about 550,000 people, on the Warta river, in west-central Poland. Famed for it’s lively nightlife and cheap beer, this seemed the perfect destination for four 30 some-things desperately clinging on to their “backpacking” youth. The trip had many highlights, including the ubiquitous cellar bars and quirky night-life on ul.Taczaka Street,…