I've been to Washington a few times, too -- most recently last July when the temp was about 105 every day. But it was very fun. Tullio, I went to the Holocaust museum, and you're right, it was unforgettable -- at least the first couple of floors. My kids and I got there a couple of hours before closing, thinking that would be plenty of time. No way. The museum is arranged chronologically, and we were looking at everything so carefully that were only up to about 1942 when the museum announced it was closing. We sprinted through the next few floors! But it was fascinating.