Map found on redditThe map above shows the size of the Roman Empire compared to the modern United States (with a bit of Canada and Mexico thrown in). In terms of numbers here’s how they look:

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Map found on redditThis map is a comparative visualization showing the territories controlled by both the Roman Empire and the Ottoman Empire at different points in history.

The map uses three colors to represent areas:

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Map found on redditThis map illustrates the Columbian Exchange, a significant event following Christopher Columbus’s voyages to the Americas.

The exchange represents the widespread transfer of plants, animals, culture, human populations, technology, and diseases between the Americas, Europe, Africa, and Asia.

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Map created by atlas_cartographyThe map you above shows the geographical spread of various Protestant denominations at the peak of the Protestant Reformation, approximately between 1545 and 1620.

Here’s a detailed breakdown of what the map shows about the spread of Protestantism during this period:

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Map created by Maps in A Nutshell.The Korean War, which lasted from June 25, 1950, to July 27, 1953, saw dramatic shifts in the fortunes of both North Korea and South Korea.

Here’s a timeline highlighting key events and the moments when both sides came close to losing the war:

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Map created by redit user Unusual_Pomelo_1553The map above shows the ancestry of US Presidents (sometimes going back up to 10 generations). He states that:

I used genealogy resources to track their ancestors to approximately 10 generations, or until the information disappears. Then I noted which countries their ancestors came from.

Virtually all of them had ancestry from many countries, not just one.

Here is a list of countries and the number of presidents with ancestry from each:

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The video above provides a concise overview of World War II in Europe, focusing on the troop strengths of various sides. It highlights the major military forces involved in the conflict, including the Allies and the Axis powers.

You can watch the sped up version below which shows everything above in just 60 seconds.

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Map found via reddit, click for larger size.

The map above shows an incredibly detailed map, in English, of the Paris Catacombs. It appears to have been made by a French company called CUBE that no longer seems to be in business.

Here is some of the extracted text (note this was done by software so may have some errors). You can read the map in full by clicking on it above:

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Map created by reddit user
Longjumping_Care989The map above shows: “Every battle in a “colonial campaign”, according to Wikipedia, fought outside Europe by selected countries, c.1400 to date.”

Here are the major colonial battels fought by each country:

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