You can find a lot of Aerial Photographs Online.  Simply type aerial photos into your favorite search engine, like Google, and click Images at the top left hand part of the screen.  If you are looking for a specific location, add that piece of information in your search query, such as Dallas, Texas aerial photos or Yankee Stadium aerial photos.  You would be surprised at how many pictures there are on the Internet of various locations that you can access for free.  In fact, a lot of events like boat shows and state fairs pay to have similar aerial photographs taken for publicity.