Wealthiest countries in Europe: Liechtenstein, Luxembourg, Ireland, Switzerland, Iceland, Norway, Denmark, Netherlands, San Marino, Sweden...
https://en.wikipedia.org/wiki/List_of_sovereign_states_in_Eu...
Largest European colonial empires: Britain, Russia, Spain, France, Portugal, Turkey, Italy, Germany, Denmark, Belgium...
https://en.wikipedia.org/wiki/List_of_largest_empires#Empire...
Some historians believe that once you account for the costs of subjugation and development, empire is not usually net profitable for the sovereign. Basically just a gigantic monument to the ruler's ego.
As Carl Sagan put it: Think of the rivers of blood spilled by all those generals and emperors so that in glory and in triumph they could become the momentary masters of a fraction of a dot.