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.

Villahermosa, the capital of Tabasco, is a city where ancient civilizations, tropical landscapes, and modern life intersect. Known as the “gateway to the Mayan world,” the city sits on the banks of the Grijalva River and serves as a cultural hub for southeastern Mexico. One of its most unique attractions is Parque-Museo La Venta, an open-air museum that blends archaeology with a jungle setting.

Buffalo, the second-largest city in New York State, sits at the eastern end of Lake Erie where the Niagara River begins its journey toward Niagara Falls. Once a powerhouse of American industry and trade, Buffalo thrived in the 19th and early 20th centuries as a major shipping and manufacturing hub, thanks to its strategic location along the Erie Canal and Great Lakes.

Lake Powell, stretching across the Utah-Arizona border, is one of the largest manmade reservoirs in the United States. Formed by the flooding of Glen Canyon after the completion of the Glen Canyon Dam in 1963, it covers over 180 miles in length and contains nearly 2,000 miles of shoreline, more than the entire West Coast of the U.S. Despite its modern origins, the area has long been home to the Ancestral Puebloans and later Navajo communities.

Falmouth, on Cornwall’s south coast, grew around one of the world’s largest natural harbors, a feature that has shaped its maritime identity for centuries. The town expanded during the age of sail, serving as a key port for packet ships, and landmarks like Pendennis Castle still anchor Falmouth firmly in its naval past.