10 most difficult Germany riddles

Leaning Tower of Suurhusen is the world's most leaning, beating the world-famous Leaning Tower of Pisa by 1.22°.

The country is only fourth in terms of area, but has a high population density (especially in the Ruhr area). Cologne is the largest city.

Crown Prince Ludwig, later to become King of Bavaria, Ludwig I, was married to Princess Therese of Saxe-Hildburghausen on October 12, 1810. The citizens of Munich were invited to attend the festivities held on the fields in front of the city gates to celebrate the happy royal event. Since then, Otoberfest is held at the same place every year (except for epidemics and wars).

1949 ended strict occupation of Germany by WWII allies. The following states formed: Federal Republic of Germany of British, French and American occupation zones, German Democratic Republic in Soviet occupation zone, and Saar Protectorate administered by French Republic. The least one even participated in 1952 Olympic games of Helsinki despite presence of united German East/West team.

The name implied that West Germany had not been fully de-Nazified. Before the Wall's erection, 3.5 million East Germans defected from the GDR. Between 1961 and 1989, the wall prevented almost all such emigration.

Altbier is a style of beer brewed in the historical region of Westphalia and around the city of Düsseldorf, Germany. Its name comes from it being top-fermented, an older method than the bottom fermentation of other lagered beers. Altbier is usually a dark copper colour. It is fermented at a moderate temperature using a top-fermenting yeast.

Obatzda (also spelt Obazda and Obatzter) is a Bavarian cheese delicacy. It is prepared by mixing two thirds aged soft cheese, usually Camembert (Romadur or similar cheeses may be used as well) and one third butter. In 2015, within the EU, obatzda was granted PGI certification.

Audi was created in 1969 as a result of NSU and The Auto Union company merge. The former NSU manufacturing plant in Neckarsulm is still used for Audi assembly, and the current Audi AG shares trade under the ticker symbol "NSU".

Hitler was born in Austria. But when he was three, his family moved to Passau, Germany. There he acquired the distinctive lower Bavarian dialect, rather than Austrian German, which marked his speech throughout his life. When Hitler was five, his family relocated back to Austria.

Karl Dönitz was the Commander-in-Chief of the Navy and briefly succeeded Adolf Hitler as the head of state of Germany. At the Nuremberg trials, he was convicted of war crimes and sentenced to ten years' imprisonment. After his release, he lived quietly in a village near Hamburg until his death of a heart attack in 1980.