Afternoon stroll on the Great Wall
The Great Wall of China may be the most impressive structure on the planet. Nothing could have prepared me for how impressive the Great Wall is in real life. There is no way to imagine how tall and long it is in real life.
Luckily, my wife and I were there in the offseason (beginning of March) so there were not too many crowds to speak of. If you are willing to walk 15-20 minutes in either direction you will find yourself alone and be able to enjoy the scenery in peace.
After we got to an isolated spot we found a bench and spent an hour just taking it all in. That afternoon was definitely one that we will never forget.