A stone’s throw away from New York’s Union Square sits intimate, Georgian-style The Jade. The entrance comes complete with burning gas lamps and opens into a sunken lobby with a library. Each room boasts nostalgic details, including ebony desks, rotary dial telephones and subway-tiled bathrooms. The best-kept secrets, however, are the second-floor rooms that come with individual garden terraces, concealed by leafy trellises.