The Sion Methodist Chapel [now the community centre in Resolven] built 1823, rebuilt 1868:
There are several plaques on the front of the building:
To commemorate the work of Sir Henry Clifford Derby (1909 - 1992) "Knight of the Valleys" Geographer, which was placed by the Resolven History Society. Read about the ceremony here.
The three Doctors of Music:
David Evans (1874 - 1948)
Tom Hopkin Evans (1879 - 1940)
William Rhys Herbert (1868 - 1921)
Some further details for William Rhys Herbert can be found here, courtesy of the Resolven History Society.
Resolven's Mining Legacy - a memorial to the miners who died whilst working the pits.
Also, the OGRE online now has transcripts of the remaining headstones at the church.