Carl’s epic adventure required a destination both fantastic and plausible. When director Pete Docter happened on a TV documentary about the mysterious tepuis of South America, he discovered the perfect world to explore.The massive mile-high plateaus in Venezuela are among the most uncharted places on Earth. Pixar sent a team of artists for a look, and the film's bizarre rock formations, exotic flora, towering waterfall, and fog-shrouded labyrinth can be traced to tepui landscapes. So fantastic were the images, Docter wondered if the very real tepuis might look too incredible.