In Dover, England.
Stone.
Henry the 111
It was not discovered, it was built
1180
go 2 google!!
The earliest castle at the site of Windsor Castle was built in 1070. The oldest building still there was built in 1154. So you might say it is 940, or 856, or just say about 900.
Because its a good military vantage point
It was built during the reign of Henry II. The architect was Maurice the Engineer, that is to say, of the first stronghold. It was extended over the centuries. So, to answer the question: there was not one builder of the Dover Castle.
It was built for defence purposes! by Nina x :) x
Dover castle was attacked by French troops that first assaulted the castle and then dug tunnels underneath it trying to get in.
The population of Dover castle is 28,156.