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1. Is the most populous one.
As of 2019, UK has passed France according to this source.
Italy
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France
Spain
2. Was once in the hands of the Muslims.
The whole Iberian peninsula was in the Umayyad hand except the northern parts. It wasn't until 1492 the Emirate of Granada fell into Catholic monarchs.
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3. Is the most visited country in the world.
86.9 mil. people visited France in 2017.
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France
4. Had the least amount of colonies.
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France
5. Has the largest economy of them all (in the nominal method).
France is only a hundred thousand US dollars behind UK.
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Italy
6. Most of world's UNESCO World Heritage Sites are in here.
54 sites for Italy, Spain is in the 2nd place with 47 sites.
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7. Is the largest producer of wine.
Italy leads the rank with France and Spain coming in 2nd and 3rd.
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8. Its national animal is bull.
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Spain
9. Was the first to abolish slavery.
UK did not abolished the practice of slavery
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10. Has two other countries inside itself.
San Marino and Vatican City are inside Italy
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11. Its capital city's Roman name was "Lutetia".
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12. The oldest building still under construction is located in here.
Located in Barcelona, Sagrada Família's construction started in 1882 and is still unfinished.
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13. Its highest point is the lowest one among the others.
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14. First country to introduce the license plate.
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15. Was neutral during the WWII.
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16. Has the shortest coastline of them all.
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17. Its alliance with Portugal is the world's oldest.
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18. Has the highest life expectancy.
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19. The only country to NOT name itself on its stamps.
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20. The largest anti-war rally took place.
In 2003 the protest involved around 3 million people that protested against the Invasion of Iraq.