Stunning pictures of a former Soviet prison that was flooded and has now become an unlikely tourist attraction.
Former gulag Rummu prison in Estonia houses hundreds of workers forced into hard labour before it was closed down with the fall of communism.
The building – standing in a quarry – was flooded and the limestone has now turned the water into a tropical blue colour.
Thousands of people line the sandy shores every summer for barbecues while scuba divers flock to the building to explore its ruins.
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