Merthyr Tydfil on Wikipedia.
 

Llwyn-On, Bethel Baptist Chapel. Originally founded in 1799 in Twynyrodyn, it was removed and re-erected at Llwyn-On in 1914. © Eirian Evans.

Treharris, Salvation Army Hall, behind scaffolding. © Rob Brettle.
Troedyrhiw, Carmel Chapel (Baptist), which dates from 1852. © Eirian Evans.
Twynyrodyn - see Llywyn-On above.