The map above shows what the borders of Europe, the Middle East and North Africa might look like if they were based on the dominant Y-DNA haplogroup rather than ethnicity and/or any other political considerations.
The map above shows the incredibly strange and complex border between Belgium and the Netherlands at Baarle-Hertog (Belgium) / Baarle-Nassau (Netherlands).
The map above is an Isochrone map which shows how long it would have taken someone to travel from Rome to the farthest reaches of the Roman Empire at its peak (roughly 200 CE/AD).
Travelling within the core of the Empire could have be done in under a week, but travelling all the way to the fringes would have taken someone more than a month.
The map above shows the Jewish population of Europe in both 1933 and 2015 by country. Most countries still had much lower Jewish populations in 2015 compared to 1933.
This is largely due to the long lasting effects of The Holocaust, when over six million European Jews were systematically murdered by Hitler and the Nazis.
Emigration to both Israel and the United States after World War 2 and again after the collapse of Communism in Eastern Europe in 1989, also contributed somewhat to the decline.
However, not all countries saw their Jewish population decrease.