Rochusgasse U-Bahn Station, Wien (Vienna), Austria, 2013

As with the Prague Metro, a number of archeological finds occurred as a result of the Vienna U-Bahn's construction. These columns, which look Roman, but are probably medieval or even Rennaissance. There isn't any historical marker for them that I noticed, but some historical detection work could be done to determine what buildings were in the area during likely time periods. This U-Bahn station, serving Line U3 only, is relatively new compared to some of the others, having opened in 1991.