Ally and Target: US Intelligence Watches Germany Closely – SPIEGEL ONLINE

The US military compound in Griesheim, near Frankfurt, is secured with a tall wire fence topped with barbed wire. The buildings are relatively modest and surrounded by large areas of green space, which has long led local residents to suspect that many of those working at the facility spend much of their time underground — and that they are engaged in espionage.

Source: Ally and Target: US Intelligence Watches Germany Closely – SPIEGEL ONLINE