In season 2 of Outlander many of the scenes set in Paris were filmed in Prague.
Prague locations included Na Kampe, found next to Charles Bridge, on the west bank of the Vlatava river. Also used for their impressive exteriors were the Vojensky kostel svateho Jana Nepomuckeho (Military Church of St. John of Nepomuk) which became the outside of L’Hopital des Anges, and the almost iconic steps of Radnicke Schody (Town Hall Stairs).
One interior location was the library Strahov Monastery, which became the library at the Palace of Versailles.