Are you ready to visit the most mysterious places hidden in the mountains? Our first stop will be in Switzerland: standing at the door of the castle, you can't really believe what you see: a 13th-century fortress built entirely of stone. On the outskirts of Çorum in Turkey, you'll find a valley filled with old overgrown mountains and see the beginning of the trail you're about to hike. The huge door is a massive arched stone that blocks the entrance to a hidden building. Experts think it has existed since the second century BCE. But let's hurry up – we have many more places to explore! #brightside Credit: CC BY 2.0 https://creativecommons.org/licenses/by/2.0/: Interior of Bet Debre Sina: Adam Jones – https://flic.kr/p/ehZ9FH, https://commons.wikimedia.org/wiki/File:Interior_of_Bet_Debre_Sina_(Bet_Mikael)_Rock-Hewn_Church_-_Lalibela_-_Ethiopia_-_01_(8724852519).jpg Predjama cave: Stephen Colebourne – https://flic.kr/p/bxoN8H, https://commons.wikimedia.org/wiki/File:Predjama_cave_behind_the_castle.jpg CC BY 3.0 https://creativecommons.org/licenses/by/3.0/: Lalibela: Sailko, https://commons.wikimedia.org/wiki/File:Lalibela,_san_giorgio,_esterno_24.jpg Lalibela: Jose Antonio, Jose Antonio https://commons.wikimedia.org/wiki/File:Lalibela_chiesa_vista_dal_basso.jpg CC BY-SA 3.0 https://creativecommons.org/licenses/by-sa/3.0/: Kropfenstein: Adrian Michael, https://commons.wikimedia.org/wiki/File:Kropfenstein_DJIc.JPG Hall of Records: Rachel.miller727, https://commons.wikimedia.org/wiki/File:Hall_of_Records_-_Behind_Mt._Rushmore.JPG Bernard Gagnon: Bete Giyorgis, https://commons.wikimedia.org/wiki/File:Bete_Giyorgis_01.jpg Bete Emmanuel, https://commons.wikimedia.org/wiki/File:Bete_Emmanuel.jpg Bete Maryam, https://commons.wikimedia.org/wiki/File:Bete_Maryam_01.jpg CC BY-SA 4.0 https://creativecommons.org/licenses/by-sa/4.0/: Kırkdilim kapılıkaya: Muhendisali19, https://commons.wikimedia.org/wiki/File:K%C4%B1rkdilim_kap%C4%B1l%C4%B1kaya.jpg Lalibela: ZDF/Terra X/interscience film/Faber Courtial/Gero von Boehm/Alexander Hein/Andreas Tiletzek, Jörg Courtial, https://commons.wikimedia.org/wiki/File:Lalibela_-_Monolithische_Felsenkirchen_(CC_BY-SA_4.0)_.webm Predjama castle: Robert Jahoda, https://commons.wikimedia.org/wiki/File:Predjama_castle_2020.jpg Animation is created by Bright Side.
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