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A beautiful gallery carved into the tuff of Clermont. Strata are clearly visible.
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Underground quarry Keppler in Mery sur Oise. Also called quarry of the Ru, name of a small river flowing nearby.
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A large arch at the entrance to the underground quarry of Eragny.
AQUATIC ARCH AXA BATTERY BIG BILLANCOURT BLOCK BOUGIVAL BOULOGNE BRIDGE BRITANNY BUILDING BUNKER BUTTRESS CASTLE CATACOMBS CATHEDRAL CB31 CENTER CHALK CHARTRES CHURCH CIMENTERIE CLINIC CONFLANS CORRIDOR COUTANCES CRANE CRUDE DEFENSE DENFERT DOME DOOR DRAWING ESSERENT ETIENNE FACTORY FACULTY FLYER FLYING FORT FRANCE FRONT GALLERY GLASSROOF GRS GYPSUM HERBLAY HONORINE HOUSE INDUSTRIAL ISLAND JAGUAR LADER LADY LEU LIMESTONE LYON MAGINOT MAHON MAP MARLY MEDICAL MEDIEVAL MERY MEUDON MILITARY MINE MINISTRY MONTALETS MONTESSON MONTROUGE MONUMENT MUSEUM MUSHROOM OCHRE OFFICIAL OISE OPERA ORANGIS ORSAY OSSUARY OUR PALACE PALAISEAU PANORAMICAL PAPERMAKING PARIS PAUL PENITENTIARY PILLAR POINT POND PONTOISE PORT PROVENCE QUARRY RAIL RAILING RENAULT RIS ROCHEREAU ROOFTOPS ROOM ROUDOUDOU SAINT SCHOOL SEGUIN SEINE SITE SOUTH STAIRS STATION STATUE STORE SWIMMING TECHNICAL THEATER TOWER TRIEL TROCADERO TUNNEL ULIS UNDERGROUND UNIVERSITY VARIOUS VAUX WAGON WALL WASTELAND WATER WELL