The Shell Grotto
As much a mystery now as when it was discovered in 1835, the Shell
Grotto comprises a 30-metre subterranean tunnel, rotunda and rectangular
“altar chamber”, hewn from a chalk hill and decorated with a mosaic
made up of roughly 4.6 million shells.
Theories abound, but nobody is too sure when the Shell Grotto was created, or why.
It may have been a folly, excavated in the 18th or 19th century by a
wealthy local resident, or a lodge for the Knights Templar or
Stonemasons, or even a chamber for pagan rituals up to 3,000 years ago.
One of the many haunting things about the grotto’s magnificent mosaic
is that while it has local mussel, cockle, whelk, limpet, oyster and
scallop shells, the background is all flat winkle shells, which could
only have come from beaches west of Southampton, more than 150 miles
away.