These pictures of windmills will give you examples of different kinds of windmills and what they look like.
Here's a large windmill at Infersa Salt Pans Marsala in Sicily Italy.
Here's a large Dutch windmill in Holland.
Here's a beautiful windmill silhouette in the sunset.
Here are rows of modern windmills generating power.
Here's an old Dutch windmill on a peninsula.
Here are some large windmills in Campo de Criptana La Mancha.