The other is called Grupo Ciudades Libres (Free Cities Group) and is the brainchild of Michael Strong and Kevin Lyons, two entrepreneurs and libertarian activists.
The nine-hour Belfast tour (an epic in itself) takes in sites around Northern Ireland, including the caves where red priestess Melisandre of Asshai gave birth to an evil shadow-baby assassin, and Ballycastle, setting for the FreeCities where the eunuch Lord Varys was born as a slave.