Dhiren Barot, of north London, planned to use a radioactive "dirty bomb" in one of a series of attacks in the UK, Woolwich Crown Court heard.
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Prosecuting QC Edmund Lawson said plans had been found by police on a computer after Barot was arrested in August 2004.
The plans were for attacks on the International Monetary Fund (IMF) and World Bank buildings in Washington, the New York Stock Exchange and Citigroup buildings in New York and the Prudential buildings in Newark, New Jersey.
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The Crown could not dispute claims from the defence that no funding had been received for the projects, nor any vehicles or bomb-making materials acquired, he said.
http://news.bbc.co.uk/1/hi/uk/6044938.stmThis was one of the men arrested after information came from a computer expert in Pakistan, which increased tge US terror scare level in August 2004, for the Democratic convention:
http://www.washingtonpost.com/wp-dyn/articles/A7913-2004Aug17.htmlAnother 7 men still await trial.