Area 51 might be barricaded by barbed wire and military guards, but this open-air exhibit welcomes all intrepid travelers. Signs that say Abducción Gratis (“Abduction Free”) and the looming figure of a crashed UFO greet visitors, encouraging guests to meet ET’s distant relatives. Situated atop a hill on the outskirts of Cusco along a winding path, visitors can pose with an assortment of extraterrestrials of all shapes, sizes, and home planets. However, this is more than a kitschy roadside attraction or opportunity for an Instagram photo-op. The interactive art compilation,…