The irreverent billboard image of America's No.1 enemy, just a short distance from the White House, is part of an activist campaign aimed at highlighting that al-Qaeda uses the US detention centre as a recruiting tool.
The metro billboard is "to remind policymakers that torture is illegal, unethical and a top recruiting tool for the terrorist leader Osama bin Laden and his al-Qaeda network", creators from the Avaaz activist group said.
Avaaz believes Guantanamo is a potent symbol for the "war on terror" torture excesses of former president George W. Bush and that al-Qaeda plays on this fact to pull in new members.
Another poster presents former vice-president Dick Cheney, who has ardently defended the controversial interrogation techniques of the Bush-era, begging the question: "Could this be al-Qaeda's best recruiter?"
The advertisement campaign aimed at shutting the detention centre at Guantanamo Bay, Cuba is being run at Farragut North metro station, one of the closest to the White House, and in the Washington Post daily newspaper.
Defence Secretary Robert Gates said on Monday that the complexities of trying to re-house the 223 inmates still at Guantanamo meant it was "going to be tough" to meet Mr Obama's January 22 deadline for the camp's closure.