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Muscat, Oman - 5-21-2022: Al-Hoota Cave, long exposure inside view of cave and green underground lake.
Looking down the length of a gypsum mining tunnel (adit) inside an abandoned quarry.
aquamarine crystal on matrix from Afghanistan isolated on white background
Granite Igneous rock sample from Shap in the UK Lake District with distinct pink Feldspar crystals
Fakilli Cave, located in Duzce, Turkey, offers a wonderful view with natural formations, stalactites and stalagmites
Crater volcano Mt.Bromo East Java,Indonesia
Photo taken September 26th, 2022, Versam, Anterior Rhine Valley, Switzerland.
chinese medicine Radix rehmanniae
Aydıntepe Yeraltı Şehri
Dead wood texture on the beach with sunlight
The landingplace for the elevator to the bottom of the magma chamber at 120 m deep. (camera dropzone)
Mineral, pink Charoit
Besides the rare stalactite decoration the walls of the underground corridors and halls are decorated with unique honeycomb and reticular silica structures crated by so-called selective corrosion. The visit ends in the Lake Dome with the beautifully lit largest underground lake in Bohemia.
Cement-making material stone
The Zeus cave, with its beautiful stalactites an stalagmites.
chinese medicine Belamcanda chinecsis rhizoma belamcandae, Pardanthus, blackberry lily on black background
Volcanic cave - Cueva de los Verdes / Lanzarote / Canary Islands
Taken in the Galapagos Islands, Ecuador
Abstracts and Details str. North Marginal, Peniche, Portugal
prismatic quartz mineral clusters on rock specimens from the UK
Dark cave view from inside with a lumen. Stalactites and stalagmites inside the stone grotto. Colorful stones in the cave. Lighting electricity beauty of the cave.
Black coal isolated on white background
Luray Caverns in Luray, Virginia on April 9th, 2021.
Tınaztepe Caves in konya seydisehir.
pyrrhotite iron sulfide rare earth mineral
Zlatibor ,Serbia - Novembar 23 ,2016:\
Aerial view, natural panorama of the savanna hills which are also known as Pajjongan hills in Bombana, Southeast Sulawesi
Rock cave as seen from the inside.
Image of Shower of sparks over stones inside a cave and with a yellow ring of light
Lava Tubes are collapsing around the Queen's Bath area of Hawaii.
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