When we search for information on a map we tend to be searching to find where something is now. But, what if you wanted to find out where something used to be? What businesses used to be located at a particular address? Where did somebody used to live? Where did all the blacksmiths used to hang out? If you are interested in find out that information there's now a solution: AddressingHistory. AddressingHistory is a recently launched web app and API that provides access to historical data consisting of digitised Scottish post office directories combined with maps from the same time period.