Margate Shell Grotto is an intriguing underground gem whose original age and purpose are unknown. Rediscovered by chance by workmen in 1835, it consists of a 2.4 metre high passage that extends to around 21 metres, completely covered in small seashells. The twisting passage leads past a circular section known as the Rotunds and terminates in a room known today as the Altar Room. It is estimated that around 4.5 million shells have been used to line the structure.
Theories as to the age of the grotto range from prehistory (created by the Phoenicians) to a rich owner’s early 19th century folly. Listed at Grade I, the grotto was for a while on the ‘Heritage at Risk’ register due to water influx but after some restoration work and the formation of a charitable trust the site has now been removed from the list.
Vistors are welcome throughout the year with prices and times on the Shell Grotto website. A programme to restore some of the missing roundels was established in 2012 and Subterranea Britannica sponsored one of these as the first of their successful grant aid programme.