Here's a look at what you need to know about Guantánamo Bay Naval Station and its detention facilities.
Facts: The base, sometime referred to as "Gitmo," is located in southeastern Cuba, on the coast of Guantánamo Bay.
The U.S. has been leasing the 45 square miles that the base sits on since 1903. The base shares a 17-mile border with Cuba.
The U.S. pays the Cuban government approximately $4,085 a year for the lease. The last time time Cuba accepted the payment was in 1959.
The lease can only be terminated by mutual agreement.
Approximately 6,000 service members, civilians and contractors work at the base.
Detention Facilities: In response to the 9/11 attacks in 2001, and subsequent military operations in Afghanistan, existing migrant detention facilities at Guantánamo were re-purposed to hold detainees in the "war on terror."
During the administration of President George W. Bush (2001-2009), the U.S. claimed that Guantánamo Bay detainees were not on U.S. soil and therefore not covered by the U.S. constitution, and that "enemy combatant" status meant they could be denied some legal protections.
Shortly after his inauguration in 2009, President Barack Obama signed an executive order to close the detention facilities within one year. However, the facilities are still open as of 2013.
There are 164 detainees at Guantánamo Bay as of August 2013. At its peak, the population of detainees exceeded 750 men.
At least seven detainees have died in custody.
It costs the U.S. Defense Department about $150 million a year to run the detention facilities.
Timeline: 1903 - The new Republic of Cuba leases 45 square miles of land in Guantánamo Bay to the U.S. for construction of a naval station. Building on the naval station begins that same year.
1934 - Cuba and the U.S. sign a perpetual lease that rents the 45 square miles of Cuba to the U.S. for $4,085.00 a year.
1991 - Approximately 34,000 Haitian refugees are detained on the base after they flee a coup in Haiti.
1994-1995 - More than 55,000 Cubans and Haitians captured at sea are kept at Guantánamo.
January 11, 2002 - The first detainees from Afghanistan and Pakistan arrive at the temporary facility of Camp X-Ray.
June 28, 2004 - A divided Supreme Court rules that the Guantánamo detainees have some rights but leaves open how these rights will be exercised.
January 18, 2005 - The Supreme Court refuses to consider whether the government's plan for military trials unfairly denies the detainees basic legal rights.
July 13, 2005 - A report presented to the Senate Armed Services details the interrogation of the suspected "20th hijacker" in the 9/11 attacks, Mohamed al-Khatani. He was forced to wear a bra, dance with a man and do dog tricks while tied to a leash. But military investigators said but that was not considered prohibited, inhumane treatment.
April 19, 2006 - Following a Freedom of Information Act lawsuit by the Associated Press, the Pentagon releases the most detailed and extensive list of detainees ever provided. It provides the names and nationalities of 558 detainees who've gone through a hearing at Guantanamo Bay.
May 15, 2006 - The Defense Department releases another list of current and former detainees to the AP. It says this list of 759 names includes everyone who has ever been held at Gitmo, since 2001. The list did not include the names of Khalid Sheikh Mohammed or Ramzi bin al Shibh.
June 10, 2006 - Three detainees, Ali Abdullah Ahmed, Mani al-Habardi al- Utaybi, and Yassar Talal al-Zahrani are found dead in their cells by guards after apparently committing suicide.
June 29, 2006 - The Supreme Court strongly limits the power of the U.S government to conduct military tribunals for suspected terrorists imprisoned at Guantánamo Bay. The 5-3 ruling effectively means officials will either have to come up with new procedures to prosecute at least 10 "enemy combatants" awaiting trial, or release them from military custody.
September 6, 2006 - President George W. Bush acknowledges that the CIA has held suspected terrorists in secret prisons overseas. He announces the transfer of 14 captured al Qaeda operatives, including Khalid Sheikh Mohammed, Ramzi bin al Shibh, and Abu Zubaydah, to Gitmo.