The most important part of an advertisement is the fact that you need to have something to sell – either a product or a service.
Go to Lonely Planet and take a look at the main web page on France. Without following any of the links, what do you think may be a highlight of France that you could sell?
Now, take a look at this France Travel Guide. Can you think of anything else?
If you are looking for something in Spain, go to the Lonely Planet site for that country.