Secluded garden

I'm gradually making a secluded garden. Obviously financial constraints inhibit progress. But the idea is to have a tranquil area for quietness and contemplation. The area will be accessed through various brick arched entrances like this one pictured top. The interior will be paved and uncomplicated. I have made drawings for a kind of observation tower next to the tall evergreens. I can sit up there in the summer evenings and look out over the Severn Estuary. It will be accessed by a secret rear archway round the back next to the greenhouses. I imagine the grand-daughters discovering the entrance and being thrilled and delighted at what they find.