Ha Long Bay, Vietnam is the most remarkable places I've been so far. In 1997 it was decided by UNESCO to become an international historic site and is therefore highly protected. Prior to '97 it was fair game to anyone to do whatever.

The sails on the Junks are stricly for show, they are far to small to move these large boats. The tide is extreme, about 6 feet on regular tides and up to 15 on full moons.