Yes, this lighthouse at the southwest tip of the Marin Headlands is still active and maintained by the U.S. Coast Guard. Getting there is a challenge. Parking is limited and the 0.5-mile walk is steep and precarious. This spot, at the "world's end," is ruggedly beautiful. Nearby, old army buildings are used for environmental education programs.

Yes, it's even more awesome than you imagined. Since it opened in 1937, this 1.7-mile suspension span between San Francisco and Marin counties has become one of the most beloved bridges in the world. A work of art, an engineering marvel, and an American icon, the Bridge is flanked on both ends by the natural beauty of the Golden Gate National Parks. Enjoy an exhilarating, but often chilly, walk across it.