Researching places to go for a romantic getaway? Northern Portugal's historic Porto should definitely be on your radar. The medieval town's artsy shops, superb port houses, rustic-chic restaurants, and scenic river lookout points -- all spilling toward the Rio Douro -- virtually vow a love-in-the-air vibe. These are Porto's seven most romantic hotels (we're talking Baroque palaces, refurbished 14th-century buildings, Art Deco landmarks, and more).