Spartacus International Gay Guide
The Spartacus International Gay Guide is an international gay travel application and formerly an annually-published guide. It was founded by John D. Stamford in 1970 as a printed guide, before being bought by Bruno Gmünder in 1987 following investigations into Stamford's tax violations and promotion of paedophilia.
Source: Wikipedia — Spartacus International Gay Guide (CC BY-SA 4.0)