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In the USA, you would have no issues for either use, as long as there is no competitor who is already using a logo for the same purposes. You will have to search the USPTO database to determine if there is a similar use.Go to this link. Select the Word and/or Design Mark Search (Structured) search link. Type in "Statue of Liberty" (including the quotation marks) in the Search Term box, and select Design Description from the Field box. Then click Submit Query. The list returned will be every U.S. Trademark containing a Statue of Liberty image. If none of the images appear to be in a use similar to your "widget" use, then you're in good shape. You would do the same thing for the "Eiffel Tower" search. Hope this helps.