The fourth dimension

At Dunwich, an entire town was swallowed by the sea over several centuries. Nothing of it is now left, though late-nineteenth-century photographs exist of its last towers standing crooked on the beach. Historical data about Dunwich is sufficiently profuse that maps have been made of the former outline of streets, buildings and churches and their positions relative to the current shore. In this way, swimming off the shingle beach, you can float over invisible streets and buildings: the further out you go, the further back in history you’ve reached. Once, unaware of the ebb tide that was ripping round the coast, I crunched over the shingle and swam to around 1842, before I realized I was being pulled rapidly out to sea, and struck out in panic for the present day.

— Robert McFarlane