The paternoster is a fascinating type of passenger elevator that operates on a continuous loop, with a chain of open compartments constantly moving up one shaft and down another without ever stopping. There are no doors, buttons, or stopping mechanisms, requiring passengers to simply step into or out of a moving compartment at their desired floor. Credit: Lasam Urme | History In Pictures

Pittsburgh street names have a sense of humor and history! Writer Grant Segall dug into the quirky, curious and sometimes head-scratching origins of the roads we travel every day. Read more at NEXTpittsburgh.com. | NEXTpittsburgh