10 most difficult Austria riddles

Habsburg dynasty is a royal dynasty whose members became the hereditary rulers of the Holy Roman Empire, and held authority over the largest realm in Europe during the Renaissance. The Habsburgs originated in Swabia, a duchy of southwestern Germany. In 1246 they took control of the duchy of Austria.

The four largest cities in Austria are Vienna (1.8 million), Graz (269,000), Linz (193,000) and Salzburg (146,000).

This institution dates back to the time of the Austrian Empire, when Emperor Joseph II made the Prater open to public in 1766. Soon the first snack bars, stalls and bowling alleys opened up on the grounds and the Wurstelprater was born. The best-known attraction is the Wiener Riesenrad, a 64.75 metre tall Ferris wheel.

A Mozartkugel (English: Mozart ball), is a small, round sugar confection made of pistachio marzipan and nougat that is covered with dark chocolate. It was originally known as Mozart-Bonbon, created in 1890 by Salzburg confectioner Paul Fürst (1856–1941) and named after Wolfgang Amadeus Mozart.

Serfaus is a municipality in the district of Landeck in the Austrian state of Tyrol. Serfaus is also known for its small hovertrain subway system, the Dorfbahn Serfaus. With four stations and a length of 1280 m (the second-shortest underground train line in the world) it allows for a complete ban of cars within the town, while at the same time maintaining the village's attractiveness to tourists, particularly skiers.

The Hotel Sacher is a five-star hotel located in the Innere Stadt first district of Vienna, Austria, vis-à-vis to the Vienna State Opera. It is famous for the specialty of the house, the Sachertorte, a chocolate cake with apricot filling. There is also an art gallery in the hotel with works from the 19th century.

OPEC was created in 1960 with headquarters in Geneva, Switzerland. It moved to Vienna, Austria in 1965.

The Kaiser roll is a typically crusty round bread roll, originally from Austria. It is made from white flour, yeast, malt, water and salt, with the top side usually divided in a symmetric pattern of five segments, separated by curved superficial cuts radiating from the centre outwards or folded in a series of overlapping lobes resembling a crown.

Bratislava is only 60 kilometers (37.3 mi) from the Austrian capital Vienna. Before the Second World War, there was a regular fast tram service between the two.

Karl-Marx-Hof was built between 1927 and 1930 by city planner Karl Ehn, a follower of Otto Wagner. It held 1,382 apartments. Only 18.5% of the 156,000 m²-large area was built up, with the rest of the area developed into play areas and gardens. At over a kilometre in length (1,100 metres)) and spanning four Straßenbahn (tram) stops, Karl-Marx-Hof is the longest single residential building in the world.