The Dan-yr-Ogof Showcaves were discovered 100 years ago today by local farmers, in the hills of the Upper Swansea Valley. As James Wright finds, they offer a glimpse much deeper into Wales' geological past.
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Outbreaks of light rain or drizzle expected around the coast and hills.
Mike and Cynthia from Ystradgynlais flew out to the German city for a weekend away.
Fine and dry at first but becoming largely cloudy with outbreaks of rain or drizzle.