Among the many medieval treasures you’ll find on a Northern Europe cruise with Holland America Line, Estonia’s capital truly stands out. The Old Town of Tallinn was named a UNESCO World Heritage Site, and a stroll through its narrow, cobbled lanes reveals a plethora of well-preserved palaces and merchant homes. Bike past the Tallinn Seaplane Harbour, visit the Estonian Open-Air Museum, attend an exclusive concert in St Nicholas Church, or travel to a family dairy farm in the idylic countryside.