The sea defences at Cleveleys are brought to life with a public art trail - one piece is Mary's Shell.
You can find the shell sat on the beach at Cleveleys. It's towards the northern end of the new promenade, opposite Jubilee Gardens and adjacent to the seafront cafe.
It's completely visible once the tide goes out, and large enough for you to climb inside it and take a really good look.
Once the tide comes in the shell fills with water and only the very top of it remains visible, poking through the waves.
It's a huge piece of public art, fastened to a base which has been fixed to concrete foundations set in the beach just in front of the cafe.
It's 8m long and 4m tall and weighs in at 16.5 tonnes, with words from the story of the Sea Swallow etched inside.
Once the tide goes out, you can climb inside and listen for the sounds of the sea and waves.