Data method
How the Castle Atlas Discovery Index Is Built
What source-identified means, what the 26,802-site count includes, and what the index does not claim.
Method and verificationA LIVING, SOURCE-LED DISCOVERY INDEX
Fortified history, mapped with its evidence intact.
Castle Atlas is a map-first historical exploration product built around 26,802 source-identified fortified sites across 156 country/territory codes. Every discovery record begins with a source identity; broader coverage is never presented as complete world coverage.
Native iOS release build verified locally. Public App Store availability has not been announced.
26,802source-identified fortified sites
156country/territory codes
4explicit discovery classes
SCOPE, WITHOUT SPIN
Discovery breadth is not profile depth.
The discovery layer provides a source-linked identity, coordinate, label, country/territory code, and type. The local release evidence separately reports 35 rich fixture profiles and 1,000 machine-enriched profiles pending publication review. It does not claim 26,802 finished histories.
Read the methodology →- Castle
- 20,599
- Fort
- 4,048
- Fortress
- 1,970
- Citadel
- 185
Snapshot reviewed August 5, 2026; public website reviewed September 1, 2026.
VERIFIED LOCAL BUILD
Map, search, sources, journeys, Passport, collections, and offline packages.
The native iOS build has local release evidence for global exploration, a searchable list alternative, filters, castle details, journeys, Passport, collections, provenance display, optional Nearby location, and bounded offline packages. Live production services and App Store authorization remain separate.
FIELD GUIDES
Research places without freezing stale travel details.
Classification guide
Castle, Fort, Fortress, or Citadel?
A source-aware field guide to the four discovery classes used by Castle Atlas.
Method and verificationPlanning method
A Source-First Castle Trip Planning Template
Plan a research route without relying on stale hours, invented coverage, or unsourced listicles.
Method and verificationRegional route
Great Britain Castle Research Route: Three Nations, Three Contexts
Use Edinburgh Castle, Caernarfon Castle, and the Tower of London to compare source types and urban settings.
3 source-identified examplesCountry guide
Ireland Castle Research Guide: Blarney as a Source Case Study
Use Blarney Castle to separate documented site history, cultural tradition, and current visitor details.
1 source-identified exampleRegional route
Iberian Fortified Heritage Research Route
Compare the Alhambra and Belém Tower without flattening palace, tower, and defense histories.
2 source-identified examplesRELEASE UPDATES
No invented download badge.
Castle Atlas will link to a storefront only after a public listing is verified. Contact support for product or release questions.