However, last fall I had the chance to explore the Rhine thanks to Viking ... to the the castle in the form of wine. Further up the river, you'll be able to tour the 800 year old Marksburg Castle ...

In under two hours, you can time-travel from modern Copenhagen to a 10th-century Viking ship, 17th-century castle, or 19th-century fairy tale. While today's Denmark is small – roughly twice the ...