The Team visit an enigmatic castle site in Wales: Llangibby Castle, also known as Tregrug Castle. The layout of the walls and the central keep are well understood, but there are huge blank spaces within the wall that seem to have had no purpose. Will Tony and the Team be able solve this mystery?

Series 17, Episode 8.

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Time Team is a British TV series following specialists who dig deep to uncover as much as they can about Britain's archaeology and history.
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