William Volker Memorial Fountain, one of hundreds of cultural and historical landmarks explored on the Clio website (courtesy Clio) What if a mobile app could clue you in on more than 40,000 historical and cultural landmarks (1,300 of them in the KC metro area alone) with just the click of a button? Or guide you on hundreds of tours here and across the country. For free. That digital “curiosity machine” actually does exist, and it’s called Clio.