National Treasure No. 1

Sungnyemun, or Namdaemun Gate, literally 'southern gate'. There used to be four great gates in Seoul, though only two remain, and even they are not the original structures. There is little left of the defensive wall (which, according to this wikipedia article, was to keep out tigers, though I'm sure it must've had other uses) that linked them, either. It was designated National Treasure number 1 on December 20, 1962. There are now 307 National Treasures in Korea, of which I have seen at least two. The Koreans also have extensive lists of 'tangible and intangible cultural properties', the latter including many Living National Treasures. As far as I know, I haven't met any of them. Maybe they'll make me one before I leave.