This month's mystery building is a spectacular swimming bath. Please email Catherine Townsend if you know where the building is ...or was.
And the answer is...
The photograph shows the Men's First Class baths at Moseley Road, Birmingham. The baths are Grade II* listed and still stand. However, whilst the Second Class baths can still be swam in, the First Class baths are not in quite such a good condition. Further information can be found at 1000yearswim.com