New Jersey is often referred to as the diner capital of the world. It has more than 600 diners which is more than any other state.
Wausau, Wisconsin
Maine
Castroville, CA
Paris, France
Venice Florida
Indianapolis, Indiana is known as the Crossroads of America and the Racing Capital of the World.
Texas
Wausau, Wisconsin
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Detroit is known as the automobile capital of the world.
Hartford, ConnecticutAccording to the Gale Guide to Cities of the United States:"Hartford, Connecticut's state capital and second largest city, is known as "the insurance capital of the world."Read more on Answers.com, via the Related link.