Hong Kong's newest luxury spa might not be so relaxing if you have a fear of heights. The new ESPA just opened in the city's Ritz-Carlton International Commerce Centre, the third tallest building in the world. ESPA sits on the 116th and 118th floors, making it the highest spa on Earth. Don't worry if you're only slightly acrophobic, though. The architects gave the space rounded edges and curved walls to create the illusion of insulation and protection from the world below. And in the relaxation room, the custom-designed lounger pods are curtained to create private, safe-feeling cocoons. The treatment we're coveting most? Their 90-minute Lava Shell Treatment ($178.50), where heated shells, warmed aromatic oils and deep-tissue-massage strokes will melt away any stress you may be feeling from the hotel's dizzying height.