The Formal Gardens at Blenheim Palace span acres around the historic Oxfordshire estate. READ MORE: RAF base warns of 'increase in activity' tomorrow ahead of eventOn Wednesday, August 12, the palace issued a "police and totally serious" visitor notice to the gardens. "We think something very big is on the way…"Teasing the "totally serious" notice, Blenheim Palace added it is "not really" serious adding: "If you know, you know." From August 10, Blenheim Palace has been hosting a 'Dinosaurs Are Forever' installation. "Making their public debut at Blenheim Palace, the exhibition offers visitors a rare opportunity to encounter the world's first named dinosaur reimagined for the 21st century.