FBI agents at the Vienna home of Hanssen in 2001, just days after he was arrested for spying. (DOUG MILLS/AP)

Seller: Bonnie Hanssen

Asking price: $725,000

Details: This five-bedroom split-level in Vienna was the home of former FBI agent Robert Hanssen for many of the years during which he sold damaging secrets to the Soviets and Russians. He and his wife bought the Virginia home for $205K in 1987, around the time he was transferred from a New York City field office to Washington; but it’s been in her name alone since 2003, two years after he began serving a life sentence in federal prison. It’s convenient to Tysons, Wolf Trap and picturesque Foxstone Park — which the spy and his foreign handlers occasionally used as a dead-drop location.