Thousands flocked to the historic HQ of the RAF in the glorious sunshine over the weekend.
Organisers at Bentley Priory Open Day put the turn-out over the four-day event at more than 5,500.
The building and grounds were the air force's HQ during the Battle of Britain, when the outnumbered RAF's victory arguably changed the course of the Second World War.
Familes were shown around the grounds and given tours by volunteers from the Bentley Priory Battle of Britain Trust and the Stanmore Aircadets.
Organiser squadron leader Erica Ferguson said: "The weather was lovely which helped but more important than the number of visitors was the support we got from the public.
"I didn't get a single complaint from anyone over the four days, it was the Blitz spirit maybe.
"We were inundated with requests to know what was happening next."
The Ministry of Defence has appointed an agent to try and find a firm that will develop the site whilst maintaining its historical character.
Planning permission has now been given for flats on the grounds while guaranteeing a museum will remain on the site.