Heritage Open Days (also known as HODs) is an annual celebration of England's history and culture[1] that allows visitors free access to heritage sites and community events that are either not usually open to the public, would normally charge an entrance fee, or that are putting on something special for the festival.

Heritage Open Days is England's largest festival of history and culture, bringing together over 2,500 organisations, 5,000 events and 40,000 volunteers.

[3][4] Organised by volunteers (often property owners or managers), Heritage Open Days is one of England's biggest voluntary cultural events, attracting some 800,000 people every year.

Each year, over 5,000 events are held, with participation from a wide range of heritage organizations, individuals, and communities.

The festival has played a vital role in raising awareness about the importance of preserving England’s historic environment and fostering a sense of national pride.