This map shows Karelia, as part of the Finnish areas ceded to Soviet Russia in 1940.
The Spanish colonies in America started falling during the Peninsular War when Spain itself was under attack from Napoleonic troops. The start of the 19th century proved to be a turning stone for the Americans when they started independence movements throughout the country. This resulted in the loss of the Spanish colonies in Central America, North America, and South America by 1825. During this time the Spanish lost most of their colonies in America except Cuba and Puerto Rico.
This map shows quite an extensive network of railway lines around Edinburgh, Scotland in 1928. Now, eighty years later many of the old railway lines on this map have been lifted.
This map shows the extent of German conquests during World War Two (shown in blue). Courtesy of Wikipedia.