Map and cards: CC BY-SA 2.0 https://creativecommons.org/licenses/by-sa/2.0/
Historical adapted data: © ALPAGE : Anne-Laure Bethe. Database ODbL 1.0; contents DbCL.
Present adapted data: © OpenStreetMap contributors, ODbL 1.0 https://www.openstreetmap.org/copyright
Photos: Charles Marville, CC0 Paris Musées / Musée Carnavalet – Histoire de Paris. Resized whole visuals to WebP.
Three.js: MIT, Copyright 2010–2026 Three.js Authors.
Fonts: SIL Open Font License.
Data CRS: EPSG:2154 relative to origin in geo.json.