It may be hard to imagine giving up one of your precious days in Paris for an excursion outside the city - whether only a half-day or full day-trip - but there are few places that are definitely worth the sacrifice. In fact, some are so charming, they hardly feel like a sacrifice at all, and will only add to your vacation.
Versailles
A guide to visiting the Château de Versailles - perhaps the most opulent palace in Europe and a UNESCO World Heritage Site.