Kalmar Union, combination of the crowns of Denmark, Sweden, and Norway, effected at Kalmar, Sweden, by Margaret I in 1397. Because all three crowns were elective, the union could not be maintained by inheritance. Margaret's successors controlled Sweden intermittently until Gustavus I of Sweden dissolved the union (1523). Norway became independent in 1814.

Cobh, a colorful harbor town in County Cork, holds a unique place in Irish history and maritime heritage. Once known as Queenstown, it was the final port of call for the Titanic in 1912. Today, the Titanic Experience Cobh offers visitors a chance to step into the footsteps of the 123 passengers who boarded that day. Located in the original White Star Line ticket office, the museum tells personal stories of those who left from this very spot, blending interactive exhibits with original artifacts.

Plovdiv, one of the oldest continuously inhabited cities in Europe, carries over 8,000 years of history layered into its streets. The Roman Theater, still in use today, was discovered by accident in the 1970s and now hosts operas and concerts overlooking the Rhodope Mountains. Nearby, visitors can walk the remains of a Roman stadium buried beneath the main pedestrian street, where modern shops and cafés stand above ancient foundations.

A city in perpetual forward motion, Abu Dhabi greets visitors with gleaming skyscrapers and opulent Islamic architecture. There is much to see here, from the recently opened Louvre Abu Dhabi to the gigantic Sheikh Zayed Grand Mosque, with its white marble splendor. Beach life and turquoise waters can be found on Saadiyat Island, Al Bateen and Corniche Beach.

A very clean and European city south of Sao Paulo, it was the center for Polish, German, Italian and Russian immigration in the late 19th and early 20th centuries.