Journey to explore three UNESCO World Heritage Sites in one voyage, from the hundreds of limestone islets in Vietnam’s scenic Ha Long Bay to the Royal Palace in Hue, and the charming, preserved history of Hoi An Ancient Town. More dramatic scenery awaits in Da Nang’s Marble Mountains, where hidden caverns house elaborate Buddhist shrines. Time in the bustling cities of Hanoi and Ho Chi Minh City is balanced with an escape to the powdery sands and sapphire seas on the Thai island paradise of Koh Samui.