It's hard to believe that the sprawling Birmingham we know today used to be nought but a small market town. The first rumblings of its industrial future came in the 16th century when local metal workers gained a national reputation, but it wasn't until the Industrial Revolution of the 18th century that Birmingham hit the big time. Luminaries of that age include Matthew Boulton and James Watt, who built the first steam engine in Handsworth in 1775; William Murdock, who invented gas lighting; printer John Baskerville and chemist Joseph Priestley. As the local coal and iron trade boomed and jewellery became an important industry during the 19th century, a massive system of canals was built to cope with the traffic. A downside of the enormous growth of factories was a rash of grotty housing conditions for the workers.