Stockholm’s old town is filled with historical buildings and relics, many of which are protected in one way or another. The oddest of these places might be a urinal that’s seen more than a century of active use. Cities changed dramatically over the course of the 20th century, but the urge to go has always been there, and always been something cities have had to deal with. The Källargränd Urinal dates to 1890, and was built right outside the old Stockholm stock exchange building, which now houses the Nobel Museum,…