There's an underground grotto in the UK that's covered with millions of seashells - and no one knows who made it

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The Shell Grotto, located in Margate, Kent, in the UK, is a stunning underground grotto elaborately decorated with 4.6 million seashells.

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Shell grotto wall

Flickr/Kotomi_

Across the grotto are chambers covered in the shells.

Once you enter the subterranean world, you'll be able to wander through 70 feet of winding passages that lead to a large rectangular chamber while gazing at the breathtaking mosaics of shells that line the walls.

Shell Grotto tunnels

Flickr/Barney Moss

There are around 70 feet of shell-covered tunnels.

Discovered more than 200 years ago, the Shell Grotto is surrounded in mystery as no one knows who made it or why it was built.

Shell Grotto blue walls

Flickr/Alastair Campbell

The shells have been placed with painstaking detail to form the intricate patterns.

The legend goes that in 1835, a man named James Newlove happened to be digging with his son when a hole appeared. He lowered his son into the hole and when the boy emerged, he spoke of the elaborate tunnels.

Shell Grotto detail

Flickr/Kotomi_

A majority of the shells come from Britain, while some, like the ones pictured here, are from the Caribbean.

A number of stories are told regarding its origin, with some saying it was once an ancient temple and others believing it was a secret meeting place for private sects.
Shell Grotto ceiling

Flickr/felibrilu

Even the ceilings are covered in the artwork.

The Grotto officially opened its doors to the public in 1838, with hundreds coming to the site to marvel at a location that had never been marked on any map, had never been discussed in tales, and had no sign of construction around the town.

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Shell Grotto shell details

Flickr/Krondol

Some of the shells from the oysters shimmer, illuminating the underground grotto.

The Shell Grotto is open to the public daily until November, and during weekends in the winter (Nov. to Feb.). Tickets cost about $3.50 for adults and $2.50 for children.