More than 300 buildings and sites of historic interest across Wales will offer free access to visitors in September.
Certain buildings that usually charge, will, for a brief period of time in September, allow the public free access. Other buildings that are usually closed to the public, will welcome visitors to explore their buildings.
The initiative, called Open Doors, is the largest annual free celebration of architecture and heritage to be held in Wales.
The Garrison Chapel in Pembroke Dock
The scheme is part of European Heritage Days - a cross-continent initiative in which buildings' normal entry fees are waived in a bid to encourage visitors to learn more about history and heritage.
This year they are running extended programmes in Monmouth, Llandaff, Swansea, Conwy, Cardiff, Ruthin, Llangollen and Denbigh.
Broneirion in Llandinam
Throughout this month there will be guided walks and heritage trails, as well as concerts and lectures. New award-winning buildings will also form part of the initiative to present a unique view of the 'heritage of tomorrow'.
Although visitors can just turn up to some sites, make sure to check before you set off, as some venues require visitors to book in advance to secure a place on a guided tour. Information on all the events and participating sites can be found on the Civic Trust Wales at www.civictrustwales.org/ehd.