The Birmingham Back to Backs (also known as Court 15) are the city's last surviving court of back-to-back houses. They are preserved as examples of the thousands of similar houses that were built around shared courtyards, for the rapidly increasing population of Britain's expanding industrial towns. They are a very particular sort of British terraced housing. This sort of housing was deemed unsatisfactory, and the passage of the Public Health Act 1875 meant that no more were built; instead byelaw terraced houses took their place. This court, at 50–54 Inge Street and 55–63 Hurst Street, is now operated as a historic house museum by the National Trust.