WALS - The World Atlas of Language Structures

It is a big list of structural features and their values in various languages. The features are in phonology, morphology, nominal categories, nominal syntax, verbal categories, word order, simple clauses, complex sentences, lexicon, sign languages, and some others.

The languages are all present-day or recent-centuries languages, and the site uses Google Maps to plot their locations with values of selected features. From Feature 81A: Order of Subject, Object and Verb, one finds that southeastern and western Eurasians prefer SVO order, while Eurasians in between prefer SOV order. Etc.

It would be interesting to see how far back in time one can reconstruct some of these features.