Step back in time and discover a labyrinth of sinkholes and caverns in the subterranean Kelly Hill Caves.

Join a guided tour operated by National Parks, beginning with an above-ground walk to set the stage for the under­ground adven­ture. Descend into an expanse of ancient caves full of beau­ti­ful yet frag­ile rock formations. Learn about the site’s geological history while enjoying a dynamic light display illuminating dramatic rock columns, multicolored shawls and towering stalagmites and stalactites.

Kelly Hill Caves Left_800x534px
Kelly Hill Caves Right_800x534px

Around two mil­lion years ago the sea was con­stant­ly chang­ing between its present lev­el and 125 metres low­er, inter­mit­tent­ly expos­ing the con­ti­nen­tal shelf. It was at this time that the dunes of Kel­ly Hill were formed as cal­care­ous shell frag­ments from the exposed sea bed were wind­blown and deposit­ed on the island’s south and west coast.

Over a long peri­od of time these dunes hard­ened into a porous lime­stone that is shaped by the action of per­co­lat­ing rainwater. At Kel­ly Hill, this has giv­en rise to an under­ground network of sink­holes and cav­erns thought to extend for kilo­me­tres.

The experience is included in the tariff and is offered on an intimate shared basis with fellow guests and possibly members of the general public at a scheduled time. Involves a steep staircase to access, confined spaces and bright lights.