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Unexplained

The Shell Grotto

Margate, Kent

An underground temple of 4.6 million seashells that nobody can explain.

In 1835 a man digging a duck pond in Margate broke into an underground passage. Inside, the walls and ceiling of winding tunnels and a rectangular chamber were covered with around 4.

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When
Found 1835
Where
51.3866, 1.3903
Group
Unexplained

Visiting

Open to visitors most of the year.

Cover of The Ledger of Lost Artifacts and Civilizations by Cale Mills
Read the full story in the book

The Ledger of Lost Artifacts and Civilizations

Not every mystery needs a lost continent. This book investigates fifty-nine real and often overlooked puzzles from the ancient and modern world: a temple older than farming itself, astonishing structures, out-of-place artifacts, and technologies lost to time. Each case is weighed honestly, with a clear ledger of the case for and against, so you can make up your own mind. Some cases collapse under scrutiny. Others remain genuinely unexplained. All of them are stranger than Atlantis.

Buy on AmazonAll books by Cale Mills

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