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Where can you find the greatest concentration of cast iron buildings in the world?

  1. Midtown

  2. Harlem

  3. Upper East Side

  4. SOHO SOuth of HOuston

The correct answer is: SOHO SOuth of HOuston

The correct answer is D. SOHO SOuth of HOuston. This area of Manhattan, south of Houston Street (hence the name SOHO), is known for having the greatest concentration of cast-iron buildings in the world. These buildings are distinctive for their architectural style and are a significant part of the neighborhood's history and charm. This area is a popular destination for tourists interested in architecture and history.