If you're in Paris check out the Sacre Couer. Best view of the city period, and if youre not horribly out of shape, you can walk up the 15 stories or so of stairs to save a wait in line. It's in the slummier part of Paris, so there's a trick the people do there to tourists. They try to tie a string on your finger, and when they can't untie it, they demand money.
If you're into the war thing, skip Frankfurt and head to Munich. Dachau is just a short train/bus ride out of town (maybe half an hour altogether). Very sobering place indeed...
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