Coinmap.org is a SatoshiLabs project which shows a map of venues where bitcoin is accepted as a payment.
For more detailed instructions, see also Apps:Coinmap
How to add a venue in coinmap.org
1. Go to coinmap.org
2. Click on the left bottom corner of the website and select a preferred login method. Trezor connect is very secure and user-friendly option.
3. After a successful login, locate the desired area.
4. Right click on the area and fill in all the requested information.
More advanced users can use the Coinmap API to get and add venues, comments and ratings. More information about the API is here.