Famous across China (although a little over-hyped if we're being honest), Old Dragon Head, 4km south of Shānhǎiguān, is where the Great Wall meets the sea. It's photogenic for sure, but bear in mind that what you see now was reconstructed in the late 1980s – the original wall crumbled away long ago.
It acts more like a small beach resort these days. In fact, you can jump in and actually swim around the Great Wall here. The water is filthy, though, so it's not surprising that the speedboat rides (¥80 per person) are more popular. Bus 25 (¥1) goes here from Shānhǎiguān’s South Gate.