India, Nov. 6 -- Hidden beneath the earth, the Shell Grotto in Kent, UK is an underground wonderland. With over '4.6 million shells' decorating its walls in intricate patterns and symbols, this mysterious structure has been fascinating visitors since its discovery in 1835. Who built it and why remains a mystery, sparking theories of secret societies. Today, it's a must-visit destination for its enigmatic and beautiful structure. Also read | 32 pics of iconic German castle that has been 'owned and occupied by the same family for 33 generations': A virtual tour

The Shell Grotto's intricate patterns and symbols, created from millions of shells, spark imagination and interpretation, but one undeniable fact remains: it's a unique work of art....