Mamertine Prison, Rome, Italy.
Carcere Mamertino according to tradition was the jail where St Peter and St Paul was imprisoned. It consists of two levels and was the most horrible part of the ancient state prison located in the caves under the Capitoline Hill. Numerous illustrious enemies of Rome died here. The higher part of the prison was built in the 2nd century BC and was named.
Mamertino.

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