Zardoz filmed at Brennanstown Riding School, Kilmacanogue. A mansion that now houses a riding school, used as the home of the immortal elite. On screen it's Hollybrook Hall.
Probable Named in published production coverage; the coordinate is the place itself, checked against a gazetteer.
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Venture keeps every scene location on one map, sorted by how far you'd have to walk. Open it in Kilmacanogue and it tells you what was shot around you, how to get there, and whether you can actually go in.
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