Bang Kwang Central Prison is located in the Nonthaburi Province of Thailand which is about seven miles north of Bangkok. This men's-only correctional facility is considered one of the worst prisons in the Far East. It's over crowded population and understaffed officers makeup much of the reason why it is one of the worst places in the world. This jail houses several foreign prisoners as well as inmates who awaiting to be put to death.

The Tadmor Prison is located in Tadmor which is in the desserts of Syria 200 kilometers from Damascus. The prison originally was meant to be a military detention facility, however during the 1980's they began housing all sorts of criminals inside. In 1980 President Hafez al-Assad order the killing of all prisoners inside which left the death total near 2,400. The prison was shut down in 2001 however its doors opened back up in 2011.

Gitarama Central Prison is located in Rwanda and known around the world as one of the worst prisons to be inside of. The conditions here are so bad that some prisoners resort to eating each others flesh just to stay alive themselves. Many prisoners who have been incarcerated in it describe it as 'hell on earth' which speaks volumes for its conditions. It was originally designed to house just 400 prisoners however as a result of the 1994 genocide in Rwa the population jumped to nearly 7,000 in the 1990's.

Diyarbakir Prison in southeastern Turkey was built in 1980. Since then it has imprisoned many of that nation's most violent criminals which is why it is one of the worst in the world. This prison is known for dishing out not just physical torture to it's inmates but mental as well. The are two sections within the facility the E-Type which has a capacity of 744 prisoners and the D-Type with a 688 capacity however both currently hold more than it should.

Alcatraz may just be the most famous prison in the entire world but it is also one of the worst to have ever held inmates captive. Located in San Francisco, California, "The Rock" as it was commonly referred to opened as a federal correctional facility in 1933 and closed its doors a jail in 1963.

The Carandiru Penitentiary is located in San Paulo, Brazil and first opened in 1920. It did not house its first criminals until 1956 and eventually closed down in 2002. In 1992 there was huge riotmassacre which occurred inside of it where 111 prisoners were killed due to the uprising. Among other major problems within this prison which held up to 8,000 inmates at a time was a huge AIDS epidemic, which is another reason it was destroyed.

Located in Lima, Peru, San Juan de Lurigancho is known by many as the toughest prison in South America. The prison has quite the over-population problem as it was constructed to hold just 2,500 prisoners but houses over 7,000 inmates to date. The environment inside is very lax which means all sorts of crimes occur including selling of drugs, rape and murder. The fact that the guards aren't truly attentive to what is going on makes this one of the world's worst prisons.

Camp 22 in North Korea may just be the worst prison in the entire world. The political prison camp's official name is actually Kwan-li-so No. 22 and is completely isolated from the outside world. Prisoners and even their families in some cases are held in lifelong detention here. There are over 50,000 inmates inside of Camp 22.

El Rodeo Prison is located in Guatire, Venezuela and is considered the country's worst inmate holding facility as well as one of the worst in the world. There are approximately 50,000 prisoners living inside of this maximum security facility. In 2011 there was a huge gang war which broke out that required the help from armed forces to end. This truly a prison that makes people never want to return if they are lucky enough to be released.

San Quentin is not only California's oldest state prison but it is also one of the most dangerous. It first opened in 1852 and currently it is the largest U.S. holding facility for male death row inmates. There is a gas chamber still inside of the prison but since 1996 all of its death row inmates have been given lethal injections. It's current population is just under 4,000 inmates.

Attica Correctional Facility is located in New York and is one of the worst prisons in the world. It is a maximum security level prison which detains many violent offenders. It was constructed in 1930 and and since then there have been several riots which have occurred there. In 1971 there was a huge riot which took place where the 2,200 inmates overtook the 33 staff members that worked there.

Rikers Island is New York City's major prison complex and holds some of the United States' fiercest criminals. The prison literally sits on an island in between the boroughs of Queens and the Bronox and is adjacent to the runways of LaGuardia Airport. Rikers Island is commonly referred to as "The Island" by New Yorkers and is known to have some of the most brutal guards in the country working within it. This is another reason why this is one of the world's most dangerous prisons.

The ADX Florence Supermax Prison is said to house the most dangerous criminals in the United States. Located in Fremont County, Colorado it has a population of just 439 inmates currently but has the tightest security in the country. Many inmates here commit suicide due to the complete isolation from everyone and everything including other inmates as well as guards. The Alcatraz of the Rockies first opened its doors in 1994.