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Romans to Tudors
Holy Islands
20,228 European monasteries and hermitages checked against the shoreline: before 800, 4.3% stood on islands, from Skellig Michael to Iona; after 1100, about one in a hundred.
This is an interactive data study by Dr Tristan Hotham, built from open data. The map runs in your browser: explore it, search for places and switch layers. The write-up explains the method and what the data shows, and the data and code are open for anyone to reuse.
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