Ha Long Bay, Vietnam
Ha Long Bay's natural beauty makes it one of Vietnam's number one tourist sites, but many claim that the high numbers of visitors are ruining it. Fortunately, the bay is a UNESCO World Heritage site.
The best way to see Ha Long's awe-inspiring limestone towers is by boat. In fact, many tourists stay overnight on a boat in the bay. You do have to pay to get in, so you might as well get your money's worth.