See where the Iranian hostage crisis took place during the 1979 Iranian Revolution at US Den of Espionage, today painted with colorful anti-American murals. Back then, a revolutionary guard took hold of the former embassy and used it as a training center. Today, the guard still looks after the building, which now houses a library and a museum--both closed to the public except on rare occasions. At the entrance, inspect the severely damaged but still-standing U.S. seal. The murals, funded by the Iranian government to suggest the political alliance between America and Israel, depict a grotesque skull-faced Statue of Liberty and the U.S. Capitol topped by the Israeli flag.