Cape Cod National Seashore
Concierge.com's insider take:
The Cape Cod National Seashore is a 43,500-acre park with great beaches, hiking, cycling, bird-watching, and nature-gazing, plus a visitor center. The seashore overlaps six towns, and is still home to some lucky individuals whose properties were grandfathered in when President John F. Kennedy established this protected area. In addition to its natural beauties, the seashore encompasses several historic sites. Inventor Guglielmo Marconi sent the first transatlantic wireless transmission from a station in Wellfleet on January 19, 1903; nine years later, the same station received the distress call from the Titanic (Wireless Rd., off Route 6). A plaque off Nauset Heights Road marks the site where a German U-boat turned its guns on Orleans during World War I—the only place in the United States that was shelled during that conflict. (No one was hurt.) Stories like these, and more about the natural surroundings, are available in two-minute messages recorded by park rangers that you can access from your cell phone. Look for the "Dial and Discover" signs.