Poland

Danube

Italy

The home of the Catholic Church is Vatican City, Rome, Italy.

It's just Catholic, not Roman Catholic. Roman is an epithet first commonly used in England after the protestant revolt to describe the Catholic Church. It is never used by the official Catholic Church.

The very first Pope, St. Peter, was buried on Vatican Hill, and the center of Catholic Christianity has been in Rome ever since, Vatican City. See Taylor R. Marshall's book, The Eternal City Rome & the Origins of Catholic Christianity. (link below)

Albania

Zagreb is the capital of Croatia.

albania

The Iberian Peninsula

tisza

plains or plains people

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Sweden

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Vistula , or Wisła

Scandinavia as the name for the combination of Norway, Sweden and Denmark. It also often includes Finland, Iceland and the Faroe Islands.

The Jura mountains join the Alps to cover approximately 70 percent of the land area of Switzerland.

megaminx

Łódź (but it's already a third largest city, as the population decreased in the 1990's)