Nazi Germany made some of the most advanced guided rockets and jet aircraft of World War II. Among its most terrifying weapons was the V-1, a jet-powered rocket that rained destruction on southern England during the final year of the war.
One of those V-1s went off course and crashed in Sweden. The United States acquired it and tried to build its own. This effort led to the construction of the Republic/Ford JB-2 Loon, an American copy of the V-1.
The war ended before the US could put the Loon into mass production, but this prototype has survived the intervening decades. The auction house Bonhams recently sold it at auction.
-via American Digest