I thought this was cool
"The author, a collector of military memorabilia,
only learned of it when he bought a pair of
American uniform trousers. In the pocket was a
map showing the location of the battery no one
knew was there. He went to it and found an
overgrown field. Searching it, he found the
entrance to a bunker. From there, Mr. Sterne
eventually bought the property and began excavating
it until he had unearthed the entire complex.
Eventually, he restored it...