As the planning authorities in Drogheda, Dundalk and the remainder of County Louth, the Louth Local Authorities are responsible for the protection of important architectural heritage. The National Inventory of Architectural Heritage (NIAH) surveyed the architectural heritage of Louth in 2005 to 2006 and was very pleasantly surprised at the importance and richness of what was found here. Highlights from this survey were published in 2008 as 'An Introduction to the Architectural Heritage of County Louth'. This book is available from good bookshops and from the County Louth Archaeological and Historical Society. The full survey is also available online (simply click on the link below). This study has been used as a basis for a thorough review of the Record of Protected Structures contained in the County Development Plan and/or the development plans. In addition to Protected Structures (which are still sometimes called 'listed buildings'), Louth has a great many Architectural Conservation Areas (ACAs), which protect wider areas of architectural interest. For a full listing of protected structures and architectural conservation areas in Louth see the relevant development plans.