How do you pack for four weeks in Europe?

We're finally packed and ready to get on the plane!!!  We lift off in just over 8 hours :-)  Packing has been a challenge but I think we've done pretty well considering we have limited ourselves to the bare essentials... Need to get at least 4 hours of sleep before the long day ahead!!! After a four hour layover in Philadelphia, we will be arriving in Lisbon, Portugal around 24 hours from now--12midnight our time.  8am ish Portugal time.  Grant's wish is to see the Liberty Bell during our layover.  We'll see if that's possible and keep you informed if his wish came true :-)  Will also post pictures along the way...  Good night.