This Tribeca spa certainly wins for most impressive interior: The swimming pool is actually inside a 250-year-old bamboo farmhouse that was reconstructed inside the hotel. Upon entering the area, past the glass-encased gym, and through the locker room, meet the floor’s focal point: a tranquil lantern-lit pool. The services are no less luxurious; the traditional shiatsu massage is performed on a tatami mattress, and the room even features a private bathing tub.