Despite its name, there's no jellyfish here, and the three-story building is far from what anyone could call cushiony. The owner originally requested a tank full of the sea creatures for his family's vacation home in Marbella, Spain—the end result, sans jellyfish, is quite stunning. The architect, Wiel ... More

40-story skyscrapers would fit comfortably inside Son Doong, a breathtaking 5.5-mile long cave—reportedly the largest in the world—located in central Vietnam, and it's open to the public for the first time. For $3,000, the cave's original explorers can give you (alongside your porter) the grand tour around ... More