A record number of visitors are expected to tour Cork city as some 40 of buildings historic and cultural significance throw open their doors to the public.
Cork Heritage Open Day first kicked off 11 years ago with just 30 buildings participating and 5,000 visitors.
Since then the annual event has grown in popularity, and this year organisers are hoping that visitor numbers will triple to 15,000 as a record of 40 buildings unlock their doors on August 22.
A special feature this year are walking tours to commemorate the 20th anniversary of blues and rock legend Rory Gallagher's death.
Tours of the port at Cork's Custom House will also feature on the list of 100 events scheduled to take place on the day.
"Cork Heritage Open Day has gone from strength to strength since it began in 2005 to mark Cork's designation as European Capital of Culture," said Niamh Twomey, heritage officer at Cork City Council.
While all the events are free, those interested in taking part are advised to book in advance as the numbers on certain tours may be limited in size.
Among the events that the public can look forward to is a children's treasure hunt where kids of all ages will explore four heritage buildings in the city; a medieval family fun day at Elizabeth Fort with historical re-enactments; and guided tours of St Fin Barre's Cathedral.
Other events include guided tours of the Ambassador Hotel as well as 'Cork's Shortest Walking Tour' - which promises to pack 250 years of the city's history into just 900 yards.
Cork Heritage Open Day marks the launch of Heritage Week, which will run from August 22 to 30. Full details of all events can be found at www.corkheritageopenday.ie.