National Geographic Travelのインスタグラム(natgeotravel) - 10月31日 05時00分

The Oweynagat cave in Rathcroghan, Ireland is known as a gateway to the demon-filled underworld and the birthplace of the Samhain festival—the traditional roots of Halloween.

Discover more at the link in bio—if you dare.

Photograph by Ronan O'Connell

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