Nantyglo Round Towers are located at , Nantyglo, near Brynmawr in the borough of Blaenau Gwent in the South Wales Valleys. The two fortified towers were constructed in the early 19th century as places of retreat by the ironmaster Joseph Bailey, after a riot was caused by his brother's threat to cut wages. They are believed to some of the last privately built defensive fortifications in Britain. One of the towers remains intact today whilst the other is ruinous having been partly demolished to salvage scrap iron in the 1940s.