It's a fair bet that 99% of the thousands who flock to Bridlington for the seaside fun have no idea that just up the road from the beach and the bright lights sits this imposing mediaeval edifice. This 12th century priory pretty much owned most of East Yorkshire at one time.The Dissolution of the Monasteries was bad news with most of the buildings being demolished, some to build the harbour piers. You can read more here and there are more pictures here. I couldn't get inside to take pictures as there was a service going on.
Why are the towers different? Your guess is as good as mine.