Just across from the Golden Waterfall, on a sea-facing bluff, are the remains of a massive copper-smelting refinery known as the 13 Levels (十三層遺址), named for its 13 levels that cascade towards the sea. Built in 1933, the refinery was an important facility for the extraction of precious metals during the Japanese occupation. The derelict buildings inspire such a heavy, dystopian industrial awe that they have not only attracted the urbex community, but were also used as a setting for music videos and art performances. The staggered complex is hauntingly beautiful when the lights come on daily from 6pm to 9pm.
If you want to get close, head up the side road just after the Golden Waterfall (on the right as you head down). The road winds up to the top level and then drops down to the village of Changren (長仁). There's a short flight of stairs across a car park to a lookout, Changren Pavilion (長仁亭), with a perfect vantage point over the refinery's remains and the bi-colored sea. You can't take a bad photograph here.