Time between visits without a visa

Question

If you go to Italy without a visa and leave at the 90 day mark, how long do you have to stay out of the country before you can return without a visa

Answer 1

Most European countries I believe will let you stay for 90 days out of 180 consecutive days, so that leaves you about 3 months before you can go back to Europe. I'm assuming you're American http://travel.state.gov/content/passports/english/go/schengen-fact-sheet.html

Bear in mind this might be dependent on the treaty Schengen countries have with your country of citizenship