Eleven museums are located along the National Mall in Washington, D.C., six others and the Smithsonian’s National Zoo are nearby, two are in New York City, and two more are in the works. Admission is ...

Work an unforgettable under-the-sea experience into your itinerary with a stop at any of these 12 aquariums — some of the best in the country. In the idyllic seaside city of Monterey ...