Hidden behind a nondescript garage door of a remote house at the end of a lonely road east of the town of Konjic in what is now Bosnia, is an abandoned relic of the Cold War.

Behind three heavy metal doors more than a metre thick, a tunnel leads to a secret bunker located 900ft (270m) underground.

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A member of the armed forces of Bosnia and Herzegovina opens a door at Josip Broz Tito's underground secret bunkerDado Ruvic/Reuters
Tito nuclear bunker
A member of the Armed Forces of Bosnia and Herzegovina walks through a tunnel in Josip Broz Tito's underground secret bunker (ARK) in KonjicDado Ruvic/Reuters
Tito nuclear bunker
A member of the Armed Forces of Bosnia and Herzegovina stands in a room containing water tanksDado Ruvic/Reuters
Tito nuclear bunker
A large underground meeting hallDado Ruvic/Reuters

Communist Yugoslavia's strongman Josip Broz Tito ordered the building of the bunker in 1953 to safeguard the country's ruling class in case of a nuclear attack.

The attack never came – and nor did Tito. Construction was finally completed in 1979 – a year before the dictator's death.

He never got to see the U-shaped complex dug into the mountain with 100 bedrooms and the "presidential bloc" containing private quarters built just for him with a king-size bed and an en-suite bathroom.

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Josip Broz Tito's private bedroomDado Ruvic/Reuters
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Tito's rather spartan private bathroomDado Ruvic/Reuters
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Tito's office, with a large portrait of the Yugoslav dictatorDado Ruvic/Reuters
Tito nuclear bunker
The office of Josip Broz Tito's secretaryDado Ruvic/Reuters

The complex, spanning 6,500 square metres, was designed to allow 350 people to live and work for six months without ever coming up for air. It had its own generators, water supply and air-conditioning system.

The existence of this atomic shelter that could withstand a nuclear attack strength of 20 kilotons was known only to four generals and the handful of soldiers guarding it.

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A tunnel lined with electric cables and switchesDado Ruvic/Reuters
Tito nuclear bunker
A device for measuring air qualityDado Ruvic/Reuters
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One of five generatorsDado Ruvic/Reuters
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Switchboards for telecommunicationsDado Ruvic/Reuters
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Phones are seen in Josip Broz Tito's underground secret bunkerDado Ruvic/Reuters
Tito nuclear bunker
Dado Ruvic/Reuters
Tito nuclear bunker
A member of the Armed Force of Bosnia and Herzegovnia poses for a picture in the telex roomDado Ruvic/Reuters
Tito nuclear bunker
A machine for communicating in codeDado Ruvic/Reuters
Tito nuclear bunker
A room containing bunks beds and a television with a little bust of Tito on itDado Ruvic/Reuters

The bunker is now open to the public as a museum and a space for modern art exhibitions.