Kahekili Highway, Pohelua Bay, Maui, Hawaii
During high tide and powerful surf, the famed Nakalele Blowhole can spout water up to 100 feet in the air, making it one of the most awe-inspiring natural sights in Maui. For that reason, the best time to view it is when waves are high—however, this advice comes with a very serious warning to keep away from the blowhole itself. After a spurt (which happens unpredictably), the waters rush back into the hole creating a vacuum effect—and tragically, there are cases where people have been sucked in, never to be seen again. If visiting, wear good hiking shoes (the rocks are slippery) and marvel at this awesome sight from a safe distance.