National Monuments (Rijksmonumenten) — RCE / Netherlands

What This Dataset Is

Point locations of all 63,073 nationally listed monuments (rijksmonumenten) in the Netherlands. These are buildings, objects, and sites protected under the Heritage Act (Erfgoedwet) for their beauty, scientific significance, or cultural-historical value. The designation means the owner must obtain a permit for any modifications, and demolition is generally prohibited.

98% are built structures (onroerend gebouwd) — houses, churches, farms, castles, mills, bridges. 2% are archaeological sites. About 22% belong to a "complex" — an ensemble of related monuments (e.g., a church with its rectory, or a farm with outbuildings).

The dataset includes a rich classification system (13 main categories, 66 subcategories) and direct URLs to each monument's register page.

Source: https://api.pdok.nl/rce/beschermde-gebieden-cultuurhistorie/ogc/v1/ Provider: RCE (Rijksdienst voor het Cultureel Erfgoed / Cultural Heritage Agency) License: Public domain (Dutch government open data)

How to Access

The data is a GeoParquet file in EPSG:28992 (Amersfoort / RD New). Use DuckDB with the spatial extension.

The file is ~3.7 MB (63,073 points). Loads entirely into memory.

Schema — Field Meanings

Important Columns

The columns you'll actually use:

• rijksmonum — monument number (primary key, use CAST(rijksmonum AS INT) for cleaner output)
• hoofdcateg — main category (13 values)
• subcategor — subcategory (66 values)
• aard_monum — built vs archaeological
• complex_nu — complex grouping (null = standalone)
• rijksurl — link to monument register
• geometry — point location

Main Categories

Location Quality

60% of point locations are approximate (globaal) — they may be off by tens to hundreds of metres. Only 33% are exact. This matters for spatial analysis: use buffered queries rather than point-in-polygon for precision-sensitive work.

Geometry Notes

• CRS is EPSG:28992 (Amersfoort / RD New). Reproject to EPSG:4326 for web maps.
• All geometries are Point (no polygons — contour data from the provider has corrupt geometry).
• Bounding box (RD): X 13,854–277,502, Y 306,993–617,910.
• rijksmonum is stored as float64 due to Shapefile origin. Cast to int for display.

Useful Query Patterns

Count monuments by main category

Find all churches

Monuments near a location (within 500m)

Find all monuments in a complex

Count monuments per municipality (spatial join)

Archaeological vs built monuments

Load into GeoPandas

Related Datasets

• Bestuurlijke Gebieden (also in this catalog): Municipality boundaries for spatial joins to count monuments per gemeente.
• BAG / INSPIRE Buildings (also in this catalog): Building footprints — join via BAG ID to get building geometry for monuments with herkomst = 'BAG'.
• Beschermde stads- en dorpsgezichten: Protected townscapes (areas rather than individual buildings), available from the same RCE/PDOK source.

Caveats

• Point locations only — no building footprints. The contour Shapefile from RCE has corrupt geometry. Use the PDOK OGC API for polygon data if needed.
• 60% approximate locations — kwaliteit_ = 'globaal' means the point may be tens to hundreds of metres from the actual monument.
• rijksmonum is float64 — cast to int for display (Shapefile artifact).
• complex_nu is null for 78% of monuments — only 22% belong to a complex.
• Legacy classification codes in parentheses (e.g., Woonhuis(K), Boerderij(M)) are from an older system. They're part of the subcategory string, not a separate field.
• Field names are truncated (e.g., hoofdcateg not hoofdcategorie, kwaliteit_ not kwaliteit) due to Shapefile's 10-character limit.

Visualization Styles

Three Mapbox GL v8 styles are available for interactive map visualization via the PMTiles file.

Style files are Mapbox GL v8 JSON with relative PMTiles source paths. They can be used with MapLibre GL JS, OpenLayers (via ol-mapbox-style), or any Mapbox GL v8-compatible renderer.

• styles/default.json — Amber/gold circles with orange stroke. Heritage-evoking warm tones. Circle size scales with zoom.
• styles/by-category.json — Monument category analysis. Colors 63,000+ monuments by hoofdcateg (13 main categories): amber for housing, brown for farms/mills, gold for castles/estates, orange for religious buildings, dark brown for military fortifications, etc. Reveals the spatial distribution of different heritage types — church-dense medieval cities, farm-rich rural areas, military coastal fortifications.
• styles/by-type.json — Built vs. archaeological. Two-tone classification by aard_monum: gold for built heritage (61,600), dark brown for archaeological sites (1,460). Shows the overwhelming dominance of built monuments and the sparse but interesting distribution of archaeological sites.

Style files are at: https://data.source.coop/cholmes/portolan-nl/rce/rijksmonumenten/styles/

Also Available As

• PMTiles (vector tiles): rijksmonumenten.pmtiles — for web map visualization. Points are dropped at lower zoom levels.
• OGC API Features: https://api.pdok.nl/rce/beschermde-gebieden-cultuurhistorie/ogc/v1/.
• Monument Register: https://monumentenregister.cultureelerfgoed.nl/ — look up any monument by number.

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Hand-maintained agent guide (ported from this collection's llms.txt in August 2026). Update it alongside collection.json.