Dublin Open House
www.idi-design.com/ or
www.architecturefoundation.ie

European Heritage Days
www.heritagedays.net
www.heritageopendays.org

London Open House
www.openhouse.org.uk

National Trust (United Kingdom)
www.nationaltrust.org.uk

New York Open House
www.ohny.org

Toronto Open House
www.torontoopenhouse.ca