From the Washington Post:
"The CIA has been hiding and interrogating some of its most important al Qaeda [sic] captives at a Soviet-era compound in Eastern Europe, according to U.S. and foreign officials familiar with the arrangement. The secret facility is part of a covert prison system set up by the CIA nearly four years ago that at various times has included sites in eight countries, including Thailand, Afghanistan and several democracies in Eastern Europe, as well as a small center at the Guantanamo Bay prison in Cuba, according to current and former intelligence officials and diplomats from three continents. The hidden global internment network is a central element in the CIA's unconventional war on terrorism [sic]. It depends on the cooperation of foreign intelligence services and on keeping even basic information about the system secret from the public, foreign officials and nearly all members of Congress charged with overseeing the CIA's covert actions. The existence and locations of the facilities -- referred to as "black sites" in classified White House, CIA, Justice Department and congressional documents -- are known to only a handful of officials in the United States and, usually, only to the president and a few top intelligence officers in each host country."
"The Washington Post is not publishing the names of the Eastern European countries involved in the covert program, at the request of senior U.S. officials. They argued that the disclosure might disrupt counterterrorism efforts in those countries and elsewhere and could make them targets of possible terrorist retaliation."