The county's county town is Shrewsbury, the birthplace of evolutionist Charles Darwin, however its largest town is Telford. Telford is known for its tourist attraction, Ironbridge Gorge. Ironbridge Gorge is the world's first iron structure. Shrewsbury is also the location of the Ditherington Flax Mill, also known as the Flaxmill Maltings, the world's the first iron-framed building. It is seen as the world's first skyscraper, described as ""the grandfather of skyscrapers"".