overview opening hours admission program Reon's Magic Cavern project has a long history, reaching back to the 1970s in Bretagne. The Petřín Magic Cavern opened in 2005. Here you can view 80 paintings in the three-floor building, which Reon transformed into a cavern and a museum dedicated to his dreamland Argondie using numerous original sculptures and many tonnes of plaster. The cavern also features a seating area with jugs of free beverages for visitors. opening hours january—december mon, tue, wed, thu, fri, sat, sun 11:00—19:00 more about opening hours admission basic 100 CZK reduced 50 CZK more about admission Source: reon.cz admission basic 100 CZK reduced 50 CZK program A short distance below the summit of Petřín hill is a house overgrown with ivy, its walls graced with masks and a gargoyle guarding its entrance with a demonic stare. If you succumb to curiosity and venture in, you will gain a wholly extraordinary artistic experience in an awesome gallery, full of fanciful paintings and sculptures in the style of l’art visionnaire. Reon Argondian has created his own fictional, fantastical country – Argondia, and his works invite you there. He produces intuitive paintings, incorporating elements of myth and legend. His paintings capture insights into a teeming world full of strange creatures, a microcosm of plants come to life with a human face and the burgeoning plant world, latticed with rays of light. The paintings employ Renaissance technique, which Reon acquired in his youth as an art-restorer of the old masters. The Magical cave is not only a gallery of paintings, but also a unique work of art in itself; in addition, you will also find it a good place to sit with pitchers of alcoholic or soft drinks to your preference. opening hours january—december mon, tue, wed, thu, fri, sat, sun 11:00—19:00