Radio Kootwijk

In the middle of nowhere on the borders of the Veluwe National Park you will find this huge concrete building: Radio Kootwijk. It's nicknamed The Cathedral, officially known as Building A.
It was used to keep in touch with the rest of the world using long wave radio. The six 212 meters high antennas have since been torn down.

Some more pics (and some other) can be found here.