Allentown, is the largest of the three Pennsylvania cities that make up the Lehigh Valley. Formerly an industrial hub, Allentown is probably most well known as the subject of the eponymous Billy Joel song. The long history of Allentown has left it with an impressive architectural heritage that includes buildings such as the neo-Roman Art Museum, which contains a reconstructed room designed by Frank Lloyd Wright. The city is also home to the Dorney Park and Wildwater Kingdom amusement park.

Queens is the most ethnically diverse area of its size on Earth, which means there's a little something for everyone. Chow down on Indian food, sit in on a traditional Irish pub music session, and dance the night away at a Puerto Rican nightclub, all of it located within a few subway stops. Queens is also the home of the Mets and the US Tennis Open, and the former home of the New York World's Fair, now Flushing Meadow-Corona Park, and Paramount Pictures, now the Museum of the Moving Image.

As automobiles became popular in the early 20th century, quiet little towns along popular roads suddenly found themselves tourist destinations. Mittenwald is one of them. This small Bavarian town in the northern foothills of the Alps, on the route to Innsbruck, Austria, has been a popular stop since the 1930s. For challenging walks, many area ski runs become hiking trails in summer. And visit the local violin museum (Mittenwald is known for the manufacture of fine string instruments).