I found a lot of foreign currency while cleaning out my father's house. German marks dated 1909, 1910, l914, etc. Money from Belgium and France also. Do you think these are worth anything?

They are no longer legal currency, but they are definitely worth something to a collector.

Their value will depend on the condition they are in, and how reletively rare they may be.

Is their a coin shop in your area? That might be a good place to start asking questions. Of course, there is also always eBay...

You may also be able to donate these items to a museum. It could also be worth exploring that path as well.