Nature's Graffiti

Challenge #176 in the Life in the Natural World series. Hosted by RuthC.
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Before humans left their marks on walls and buildings, nature was already demonstrating graffiti in interesting places. Show us some examples of this. It may be carvings by beetles under tree bark, snail trails, leaves with wandering paths beneath their surfaces caused by tiny insects, tidal marks in the beach sand... Please, no graffiti or markings made by humans or domestic pets, and minimal evidence of man or man-made structures. Macro and close-ups welcome. Size of entry: 1,600 pixels on the longer side.
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Domica Cave
by Dyun27
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4th place
Domica cave is located in Slovakia near the Hungarian border. It is approximately 2 million years old and it takes about 10 to 15 years for a single millimeter cubed to grow in order to form a stalactite or stalagmite. The cave was formed with the help of water soaking through the ground, making beauty like this possible. An underground river (named Stix after the one from Greek mythology) flows through this cave and tours include a short boat trip on that river. The water is unbelievably clear and apparently is home to a few creatures such as small crayfish.
Submitted: Thursday, 19th November, 2015 01:43 (GMT)
Taken: Sunday, 28th July, 2013
Focal length: 28 mm
Shutter speed: 1/25 sec
Aperture: F2.8
ISO: 2500
Views: 510
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