Take a trip up to London and get a bird’s eye view of the city from the London Eye. See sights like Parliament, Westminster Abbey and Piccadilly. Stroll along Lower Regent Street or visit the British Museum.

Rotterdam holds the impressive title of Europe's largest port and that vibrancy extends throughout the city. To get your bearings, go up the Euromast and Space Tower, the highest point in the Netherlands. Riding a small boat through the many channels and waterways provides another unique perspective. The only truly historic sections are the 17th-century Delfshaven and Oude Haven; the rest of Rotterdam boasts highly contemporary, often whimsical architecture. For a respite, enjoy the Arboretum Trompenburg, a garden oasis of more than 4,000 plants. Art from Dutch and Flemish masters such as Rembrandt can be seen in the Museum Boijmans Van Beuningen.

Overlooking a gorgeous fjord, Norway's capital and largest city simply radiates with natural beauty and sophistication. Oslo's rich seafaring history is on display at the Viking Ships Museum, rivaled only by the Kon-Tiki Museum, which holds the balsawood raft that Norwegian adventurer Thor Heyerdahl used to sail from Peru to Polynesia. History aside, Oslo exudes a love of the outdoors in city parks like Vigeland, which is adorned with over 200 life-size sculptures by artist Gustav Vigeland. Much of Oslo is heavily forested with pines, making it one of Europe's greenest cities.

One look at the abundance of canals and gabled houses in Gothenburg, and it's clear that the Dutch founded this robust city on the Göta River. That was in 1621, close to the time that mighty Elfsborg Fortress was built at the harbor's mouth. Touring the citadel is fascinating, as are the 17th-century Crown House, Maritiman ship museum, and Gothenburg Art Museum, with masterpieces from Edvard Munch to Picasso. Gothenburg is one of Sweden's greenest cities, compliments of parks such as Slottsskogen. For a vibrant atmosphere, walk along Kungsportavenyn, Gothenburg's main street, which is a hive of cafés, boutiques and plazas.

Kalundborg is a Danish city with a population of 16,268, the main town of the municipality of the same name and the site of its municipal council. It is situated on the northwestern coast of the largest Danish island, Zealand, on the opposite, eastern side of which lies the capital Copenhagen, 110 km away.

Enjoy a scenic drive to the German capital and savor landmarks like the Brandenburg Gate and the glorious Charlottenburg Palace. Stroll down Unter den Linden, see the site of the Berlin Wall and take a boat ride along the city's canals. Explore on your own and visit one of the many museums. Or discover charming Warnemünde and its lovely Gothic church, market square and seaside promenade.

Largely rebuilt after World War II, Rønne still feels historic because even the new buildings reflect the older architecture. As a result, walking from more modern areas into the charming Old Town (Gamle Stan) is less noticeable. Don't miss the 14th-century St. Nicholas Church, one of the more historic buildings on Bornholm Island, or the massive round-tower castle and its fascinating military museum in the south of Rønne. To better understand the island's seafaring and natural history, visit Bornholm Museum.

Enjoy the lovely countryside beyond the towered walls and take in the view of this former Hanseatic League town before exploring its narrow, winding lanes, marvelous ruined medieval churches and impressive St. Mary's Cathedral. Or visit an intriguing Bronze Age burial in the midst of farmland and take in the cliff-top view of the precipitous coastline.

Admire the city's stunning modern architecture, visit its lovely parks and bustling open-air market. Take a harbor cruise past forests, beaches, villas and a ruined Suomenlinna fortress that spans five islands. Or visit historic, colorful Porvoo, Finland's second oldest town.

Step back in time as you walk through this beautifully preserved medieval town and discover its upper and lower levels, the guild houses, the churches and squares, the famous apothecary shop and the exquisite town hall. See delightful parks, Baroque palaces and a ruined 15th century convent. Or visit a lovely recreated rural Estonian village by the sea.

Spend a marvelous day discovering this lovely city and its beautiful buildings. Visit the charming Old Town, medieval Gamla Stan, the elegant royal palace, the wonderful parks and the impressive Vasa, the magnificently restored 17th century warship that sank in the harbor on her maiden voyage.

See another side of this lovely city with a cruise along its charming canals. Visit the quaint old harbor at Nyhavn and beautiful Rosenborg Castle and, of course, the famed statue of the Little Mermaid. Or venture into the countryside and enjoy its panoramic vistas, fairy tale castles and the village of Fredensborg.