Founded by Vikings in the 8th century, the city of Aarhus wants to proudly put its history on display. So officials in Denmark's second largest city have come up with a unique way to reach a captive audience: by sticking images of Vikings holding axes and shields in the red and green pedestrian crossing signals. The first set was installed on Monday, with plans to have 17 completed. Each runs at about $150. City councilor Buenyamin Simsek hatched the idea last year, teaming up with the Moesgaard Museum for the project. What piece from your city's history is celebrated?