Caves made by men during the exploration of the cement quarry (now closed and open for public) at the Sint-Pieterserg in Maastricht, Netherlands

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Size: 6357px × 4238px
Location: Sint Pietersberg, Maastricht, Netherlands
Photo credit: © Ger Beekes / Alamy / Afripics
License: Royalty Free
Model Released: No

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