Some of the sweetest travel moments need no translation. Foreign and Chinese tourists shared cute exchanges on the tunnel escalator leading to Tianmen Cave in Zhangjiajie National Forest Park in China, turning the ride into an international "friendship tunnel.” 

Known as Heaven's Gate, Tianmen Cave is a natural water-eroded cave at an elevation of more than 1,300 meters. Serving the landmark is the world's first and longest mountain tunnel escalator system, carrying visitors 340 meters through the interior of the mountain.