Spandau

Years ago, I asked on Usenet whether Spandau Prison had actually been torn down--I had heard that the plans for doing so after the death of Rudolph Hess had been abandoned.

Boy, was I wrong.

From the Wikipedia:

The prison was near, though not part of, the ancient Spandau Citadel fortress and was demolished after the death of Hess in 1987 (who had been the only prisoner since 1966) to prevent it becoming a Neo-Nazi shrine. To further ensure its erasure, the site was made into a complex parking facility, and all demolished materials from the prison were ground to powder and dispersed into the cold waters of the North Sea.

Cut off the head, fill the mouth with garlic, burn the body, scatter the ashes. It's the only way to be sure.