the most dangerous prison in the world

 Here is the prison where inmates executed Americans

Holmsburg a prison which was built in 1895, was a prison for the most dangerous prisoners, mostly sentenced to death and those serving a life sentence 

 Holmsburg Prison in Philadelphia, known as the frishëm prison in the world, where during its centuries-old history has gone through many bloody riots, abuse of prisoners through chemical experiments with prisoners scary.

Now where are executed more prisoners has become a ruin