Pembrokeshire purportedly has more castles and Norman churches than anywhere else in the UK.

This site has a useful map of all the castles in Pembrokeshire:

The best link for castles in Pembrokeshire

Other links for castles:

Manorbier Castle

Carew Castle & Tidal Mill

Haverford West Castle 

Pembroke Castle

Narberth Castle

Castell Henllys - Iron Age Hill Fort

Historical  Places of Interest

Caldey Island

St David's Cathedral & Bishops Palace

The Tudor Merchants

Gors Fawr stone circle near Mynachlog-ddu

Dylan Thomas Boathouse