St Peter-on-the-Wall, Bradwell-on-Sea

A seventh-century chapel standing utterly alone where the Dengie peninsula meets the sea — St Peter-on-the-Wall is one of the oldest largely intact churches in England, built by St Cedd from the rubble of a Roman fort, and from the air it's a tiny stone ark in an enormous flatness of saltmarsh, mudflat and sky. This is minimalist drone country: long sightlines down the sea wall, abstract patterns in the Blackwater's low-tide mud, the decommissioned Bradwell power station's grey blocks to the west and wind farms shimmering offshore. The old restricted area over the nuclear site was revoked back in 2016 when decommissioning advanced, so there's no airspace catch — though the site itself is still secure land, so photograph it from a distance rather than overflying. It's a 700-metre walk from the car park along a Roman road track; there's no shelter, and wind over the Dengie is relentless, so budget battery for the return leg. The Dengie flats are a huge SSSI holding vast winter wader and brent goose roosts — in the cold months, stay over the land side and leave the mud alone. Pilgrims visit in trickles; you'll mostly share the place with skylarks.