Ha· Long Bay seaplane

In the Gulf of Tonkin off of northeastern Vietnam, Ha· Long Bay is known for its 1,600 naturally sculpted limestone islands and islets. From one of those islands, Tuãn Châu (accessible by road), 25-minute flightseeing trips above the bay are operated daily by Hai Au Aviation (70-72 Ba Trieu Street, Hoan Kiem District, Hanoi, Vietnam; phone +84 [0] 96 296 0689, www.seaplanes.vn/en). A ticket costs VND5,912,500 (near $274). The seaplane departs from and returns to the Tuãn Châu Marina.