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People ride on a a paternoster elevator in Prague, Czech Republic, Thursday, September 7, 2017. For visitors to Prague, the recent opening of a rooftop terrace on the Art Nouveau Lucerna Palace building offers a double attraction: a sweeping rooftop view of the old town, and a rare ride in a paternoster – a cyclic elevator with no doors that works on a circuit and never stops moving, a relic from a time when safety regulations were more lax, invented in the late 19th century, of which only about 200 to 300 are still in use in central and eastern Europe. (Photo by Adam Pemble/AP Photo)
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