There has been some confusion about the Latin Mass. I'm not sure how the topic came up, but I can explain things. In general, there are two different masses that the Catholic Church offers.
1. The Old One, sometimes called "the extraordinary form", "usus antiquior" or "Tridentine mass". Pope St. Pius V instituted this in 1570. It is always performed in Latin.
2. The New One, sometimes called "ordinary form", "novus ordo", or "the mass of Paul VI". Pope Paul VI instituted this in 1969. It is rarely performed in Latin.
If someone talks about Latin mass, they usually mean the old mass.
The official rulebook says that the new mass can be performed in the local language, but it should usually be in Latin. The crazy people in the 60's and 70's decided this rule means "never ever do the mass in Latin". So despite the official recommendation, you'll have a hard time finding any place that does the new mass in Latin.
You'll also have a hard time finding a place which does the old mass; the crazy people in the 60's and 70's banned it in most areas. In 2007, Pope Benedict XVI officially declared that priests can celebrate either mass. It seems weird that the Pope had to legalize the Latin mass, considering that Latin is the official language of the Catholic Church, but that's what happened.