In the first building there were many pictures showing daily life in the prison. There were also two scale models which showed the park today and how crowded it was when the prison was operating. There were many buildings and very little, if any, place for the prisoners to exercise. Probably the highlight of this first building were the demonstrations of the three methods of execution which were used in Thailand. In the first room, models were used to show execution by sword. Three men were used during the execution. One would dance and prance in front of the prisoner, and when they thought he was calm, the second guard would creep up from behind and chop off his head. On display are some of the original swords used to behead prisoners. There is even a picture of the last executioner who was kept busy chopping off heads as late as 1934. On display was also an axe which was used to chop off the feet. Their shackles were welded on tight so the easiest way to remove the chains was to cut of the feet.

The next method of execution was by gun. The prisoner was tied to a wooden cross with lotus flowers tied between his palms. A screen with a target marked on it was then placed between the prisoner and the gunman. This way the gunman never saw the man he was about to shoot. Between 1934 and 1977, a total of 213 prisoners were executed in this manner. Finally, after a visit to America, the prison authorities decided to change the method of execution to lethal injection. The first execution by this method took place in 2003. In the third room there is a table showing how the prisoner was strapped down before being injected. Many of the displays have English translations, however, there are some sections where the information is only in Thai.