It’s common to find a mint on your pillow or ho-hum toiletries in the average hotel room. But have you had air as an in-room amenity? The Hotel Monasterio in Cuzco, Peru, supplements 50 of its rooms with oxygen. Lodged in the rare Andes air, at 11,000 feet, the 02-boosted quarters aim to reduce elevation-induced headaches and nausea. Breathe freely, but not for free. Rooms from $240. (800) 223-6800,