A circular fort commanding the eastern side of Harwich port. It was built between 1807 and 1809 to support Landguard Fort on the opposite shore near Felixstowe and to form part of the chain of Martello Tower defences. It is 200 feet in diameter, is surrounded by a deep ditch and can only be entered by one removable drawbridge. It was originally armed with 10 cannon but these were upgraded in the 1860's and 1870's and by 1872 three 9 inch RML guns were in place. One still remains although it is thought the other two are buried in the moat. In the 1920's it was abandoned and the surrounding housing built. It was taken over by the Harwich Society in 1969, by which time it was completely overgrown, but it has now been fully restored.

Copenhagen is a lively city with storybook charm. Tourists will want to view the Little Mermaid statue, inspired by the fairy tale; visit Tivoli Gardens, the world-famous amusement park; and witness the changing of the guard at Amalienborg Palace, the residence of the members of Europe's oldest royal dynasty. The best excursions feature these major attractions, as well as the Kronborg Castle in nearby Elsinore, the setting of Shakespeare's "Hamlet."

Passengers are usually taken by train from the port city of Warnemunde to Berlin. In Berlin, step back into the city's turbulent past at the Brandenburg Gate, once closed between East and West Berlin, then reopened in 1989 when the Berlin Wall came down. View the famous sculpture of Queen Nefertiti at the Egyptian Museum, or wander among the shops and cafes of the Kurfurstendamm and Unter den Linden, two of the city's historic boulevards. Tourists staying at port can stroll past the fishermen's cottages on the old Alter Strom harbor.

In this Hanseatic city founded in the 13th century, nearly every building is a sight to see. Its medieval spirit is reflected in the main square, towering spires, cobblestone streets and the stone walls that encompass the city. Explore the gothic Church of St. Olai, handicraft shops and the 13th-century Danish Toompea Castle.

This city along the Neva River embodies some of Russia's greatest treasures, and some ships stay in port overnight to allow passengers time to see the myriad sites. A few of the major attractions include the famous masterpieces at the Hermitage Museum, the baroque-style Winter Palace, St. Isaac's Cathedral with its 300-foot gilt cupola and the Bronze Horseman, a monument to Peter the Great.

Finland's national capital is a lively, neoclassical city. The most obligatory site here is the tremendous Temppeliaukio Church, carved from solid stone. Popular excursions cover the Senate Square, the Lutheran Cathedral, Sibelius Monument, Finlandia Concert Hall, market square and Esplanadi Park.

This immaculate city sprawls across more than a dozen islands connected by bridges. The best half-day shore excursions tour Gamla Stan, or old town, with its narrow cobblestone streets and buildings that date to the 17th and 18th centuries. Stops typically include Stortorget Square and its historic stock exchange; the hall where Nobel Laureates are honored; the great warship Vasa; and the Royal Palace to watch the changing of the guard. A trip to Drottningholm Palace, which houses a splendid working 18th-century theater, also is popular.