High on a hill, in a leafy, residential neighborhood between Georgetown and the National Cathedral in Washington, D.C., the Russian Embassy sits behind tall gates. It was right here, in the 1980s, at the height of the Cold War, that the FBI and the National Security Agency built a tunnel — a secret tunnel that started beneath one of the pleasant-looking houses lining Wisconsin Avenue and extended over to the neighboring embassy.
NPR: Decades after Cold War’s end, US-Russia espionage rivalry evolves

A picture taken on May 6, 2016 in Moscow shows the Great Kremlin Palace (C) and The Ivan the Great Bell Tower (R) the tallest of the towers in the Moscow Kremlin complex.