Visitor levies are used successfully in many parts of the world, including Manchester, Greece, Germany, Netherlands, Spain, Portugal and California.
Caiff ardollau ymwelwyr eu defnyddio'n llwyddiannus mewn sawl rhan o'r byd, gan gynnwys ym Manceinion, Gwlad Groeg, yr Almaen, yr Iseldiroedd, Sbaen, Portiwgal a Chaliffornia.