What is this weird stone chest?

What is this weird stone chest? - Thematic garden with big stones and hammers on metal rack near lush potted plants on grassland on sunny day

I found this chest which looks like it's made of stone. I can't open it, even with a key. How do I get in there?

Image of stone chest

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Pictures about "What is this weird stone chest?"

What is this weird stone chest? - Stacked stone pots in summer sunny garden

What is this weird stone chest? - Tabby ginger cat with white chest standing near blue wall under sunlight on pavement with shadow in district of old town

What is this weird stone chest? - Unemotional shirtless ethnic male with makeup wearing fingerless gloves looking at camera through net fence

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Images: Quang Nguyen Vinh, Quang Nguyen Vinh, Ryutaro Tsukata, Eman Genatilan