Castles
Medieval passages behind stone walls
HiddenCHI Roadoors
The world behind the walls
Explore secret passages, sealed crypts, and urban thresholds — from papal escape routes to metro tunnels that outlived their maps.
41.9022° N
12.4583° E
ELEV +24m
Five thresholds · one atlas
Palaces
Royal corridors the public never sees
Cathedrals
Sacred doors and sealed crypts
Old Cities
Urban secrets beneath cobblestones
Metro
Tunnels that outlived their maps
Featured coordinates
Pin trail
Three doors from the catalog — each with history, visit status, and what waits on the other side.
41.9022° N · 12.4583° E · Cathedrals
Passetto di Borgo
Vatican City
You never knew this door existed — the Pope's escape route above Rome.
47.6161° N · 1.5172° E · Castles
Double Helix Staircase
Chambord, France
A staircase designed so you can pass someone without ever meeting them.
48.8049° N · 2.1204° E · Palaces
King's Private Apartments
Versailles, France
Behind gilded panels, Louis XIV kept rooms the court never entered.
Field notes
What waits behind the lintel
Built for explorers who want context, maps, and stories — not just pretty photos.
Viral thresholds
Browse featured hidden doors with history, visit status, and the story of what lies on the other side — from papal escape routes to double-helix staircases.
Secret cities ranked
Rank cities by how many passages they conceal, open map spreads, and drill into local catalogs of doors you never knew existed.
Stories & saved doors
Read narrative threads tied to each place, bookmark favorites, and track recently opened doors as you build your personal archive.
Atmosphere
Through the keyhole
Visual vignettes — drop generated assets into assets/ or run the Sion asset script.
Privacy Policy
Last updated: July 7, 2026
HiddenCHI Roadoors (“the App”) is developed by Sied LLC. This policy describes how we handle information when you use the App.
Information we collect
HiddenCHI Roadoors is designed to work without accounts. The App stores preferences, favorites, and recently viewed places locally on your device. We do not collect, transmit, or sell personal data to third parties through the App.
Local storage
Data such as saved doors, search history, and onboarding completion remains on your device. Uninstalling the App removes this local data.
Third-party services
The App does not integrate third-party analytics or advertising SDKs. If this changes in a future version, this policy will be updated before collection begins.
Children
The App is not directed at children under 13. We do not knowingly collect personal information from children.
Changes
We may update this Privacy Policy from time to time. Continued use of the App after changes constitutes acceptance of the revised policy.
Contact
Questions about privacy: ronaldcatheywork@gmail.com
Support
Need help with HiddenCHI Roadoors — navigation, saved places, or a detail that looks wrong? We're here.
- Check that you're on the latest App Store version.
- Restart the App if favorites or recent places don't appear.
- For persistent issues, email us with your iOS version and a short description.