On the German island of Rügen in the Baltic Sea is the world’s largest hotel. The hotel is so big that it covers about three miles and has 10,000 bedrooms that all face the sea, however, despite being built about 70 years ago, it has never seen a guest staying over. It was named Prora and has been built by Nazis between 1936 and 1939 upon Hitler’s orders. The building project was left unfinished owing to Hitler’s commitment to war.
The structure extends over a length of 3 miles and is about 150 meters away from the beach. 
During its time of construction, all major companies of Reich along with about 9,000 workers were part of the project. 
The construction was ceased when the WWII started in 1939 and the construction workers were shifted to weapon factories. 
Swimming pools and festival hall were never materialized, while the 8 housing blocks along with cinema and theater remained as empty shells. 
A number of folks from Hamburg took refuge in one of the housing blocks during the Allied bombing campaign. 
Prora functioned as a military outpost for the East German Army after the war, however, ever since the German reunification in 1990, the buildings have been empty. 
It was designed to accommodate 20,000 guests and was part of Nazis’ ‘Strength Through Joy’ (“Kraft durch Freude”) program.
The idea was to provide leisure activities for German workers and to spread Nazi propaganda.
The whole place still stands being almost deserted except for the disco and a small museum.
The locals call Prora the Colossus owing to its mammoth monumental structure.
Vandals have smashed a lot of windows.
Following years of debate, it has been decided that Prora shall be transformed into a modern holiday resort and following the decision 4-5 blocks have already been sold to private investors.
Developers have a new vision; they plan on building hundreds of holiday apartments that will include discos, cafes, sports halls, hotels and swimming pools to bring thousands of visitors to the building.