The Smallest House in Great Britain, also known as the Quay House, resides on the quay in Conwy(a walled market town on the north coast) Wales. Built in the 16th century, and inhabited until 1900, the residence is 3 metres by 1.8 metres (10 foot by 6 foot) in size. (You can visit for £2.50.) The Welsh lady stands outside most days, according to the sources I perused, although no one seems to know why. (image by LSessions on beautyineverything)
You said the game changer wasn't ship related, but does the episode have any major ship moments?