Latin gives you a framework for many European languages.
For instance, if you know Latin and French, you can actually read some Italian fairly easily, such as "6 characters in search of an author" with very little need to look up words. ( you can ignore all the odd endings)
Latin also provides a framework for some of the grammar of Russian. Remember "bonus, bona, bonum"? Well, Russian adjectives follow a 3-gender/6case distribution, too.