sunny day at a park in front of a large building, likely a palace or grand estate

sunny day at a park in front of a large building, likely a palace or grand estate. The building is light-colored with a tall, dome-shaped tower topped with a flag. A large green field stretches out in front of the building. People are scattered across the field, some lying down, sitting, walking, or cycling. Several bare trees dot the landscape. The sun is bright and high in the clear blue sky. The camera appears to be held at a low angle, perhaps from someone lying on the grass.