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Stretching for over three miles along the white sandy beach on Germany's Baltic Sea island of Ruegen, lies the world’s biggest hotel with 10,000 bedrooms all facing the sea. But for 70 years since it was built, no holiday maker has ever stayed there.

This is hotel Prora, a massive building complex built between 1936 and 1939 by the Nazis as part of their "Strength through Joy" ("Kraft durch Freude," KdF) programme. The aim was to provide leisure activities for German workers and spread Nazi propaganda. Locals call Prora the Colossus because of its monumental structure, according to Amazingplanet.com.

Hitler's plans for Prora were ambitious. But before the building could be completed, Hitler’s priorities changed. He transferred the construction workers to build the V-Weapons plant at Peenemünde instead.

Today, the whole place is still pretty much deserted except for a few blocks that has been repurposed for other uses. In 2011, one block was converted into a 400-bed youth hostel and the plan now is to turn Prora into a modern holiday resort with 300 beds that includes tennis courts and swimming pool and a small shopping center.