Another thing I enjoy about world's fairs is the food. Some fairs have had very well known and well remembered treats like the Belgian Waffles seen here in 1964. Other fairs may not have had a breakout menu offering, but they're still fun to go to and tempt the taste buds.
After all, it takes a lot of energy to walk the grounds of these events, so we're entitled to induge a bit, aren't we? Have a hot dog, or pizza, some soda, ice cream, popcorn, candy, or other such diet destroying fun. You deserve it.