(Source: MADGIC staff)
The Ordnance Survey of Ireland has provided this map viewer for some of their map series: Street map -- Orthos, 2005, 2000 and 1995 -- Historic 6" -- Historic 6" b&w -- Historic 25".
The historic maps have a set of layers such as breweries, gas works, mills, mines, asylums, cemetaries, schools, water-related layers, jails and public buildings.
(Source: Ordnance Survey Ireland)
Transportation for America has created this interactive map, "2015 Bridge Conditions" showing which bridges in the U.S. are structurally sound or which ones are not.
Turns out, 1 in 9 bridges are deficient.
The map allows you to enter a place or an address and search a 10-mile radius. Any bridge marked deficient by the United States Department of Transportation (USDOT) will show up in red. When you click on a map, you will learn about its ratings and last inspection , how many cars travel across it on average per day, and when it was built.
(Source: Google Maps Mania)