A cenote is a natural phenomenon, a sinkhole in the Earth’s surface. The Yucatan Peninsula in Mexico has an estimated 7,000 cenotes because it is primarily made up of porous limestone. For millions of years, rainfall slowly ate away at the limestone and a huge system of underground caves and caverns was formed. Many filled with water from rain or from the underground water table. When the roof of a water filled cave collapses, a cenote is born. The water found in a cenote may be fresh water, salt water, or both. Structurally it may be completely open, like a lake, almost completely closed with just a small opening at the top, or somewhere in between.

“After taking LSD. I lighting up a candle in the middle of the wood and during the 30 secondes of exposure, i make a meditation about the holism of nature surrounding me. Feeling the crystal vibration irradiating from the center of the Gaia mother earth. So in this picture i try to show you the magic, sacred metaphysical quality of the nature and new age bullshiting you”. – Benoit Paillé. (Photo by Benoit Paillé)

A graffiti, portraying a woman, is seen in Medellin, Colombia on November 19, 2017. Mural graffitis from different artists, street art can be seen in almost every city on Earth, but street arts raw power and potential for change was felt by me most intensively in Medellins Comuna 13, previously one of Colombias most dangerous neighbourhoods, in fact Communa 13 was constant battleground between gangs, narcos, paramilitaries and the government, but today you would hardly recognise it. (Photo by Juancho Torres/Anadolu Agency/Getty Images)

Globe-trotting photographer couple Peter Sedlacik and Zuzu Galova have found a fun way to document their travels around the world. Wherever they are, they face each other, frame up a great composition, and take a picture of each other… taking a picture of each other. Thus was born the photo series/project “Lens Between Us”, which is quickly scooping up followers on Tumblr, Facebook and Instagram alike. The resulting diptychs are creative, well-composed, and whimsical in the best way. A tribute to how their focus is always on each other, the images are part travel photography, part portraiture, and challenging to boot since each shot requires that they figure out not one, but two compositions. (Photo by Peter Sedlacik/Zuzu Galova)

In this handout image provided by the National Oceanic and Atmospheric Administration (NOAA), model runs from the Center for Tsunami Research at the NOAA Pacific Marine Environmental Laboratory show the expected wave heights of the tsunami as it travels across the Pacific basin March 11, 2011. The largest wave heights are expected near the earthquake epicenter, off Japan. The wave will decrease in height as it travels across the deep Pacific but grow taller as it nears coastal areas. In general, as the energy of the wave decreases with distance, the near shore heights will also decrease (e.g., coastal Hawaii will not expect heights of that encountered in coastal Japan). (Photo by NOAA via Getty Images)

These are the stunning images of what looks like a picturesque winter wonderland – but actually shot in the middle of summer. Amateur photographer Catherine Perkinton, 45, has spent the summer travelling around the country to create the fabulous images by utilising infra-red. (Photo by Catherine Perkinton/SWNS/ABACAPress)

Joel said documenting the Kazakh nomad summer migration was really an epic journey – a time travel journey – and at the same time was possible to get an understanding of how the balance of nature is still possible in Altai Mountains, Mongolia, June 2015. (Photo by Joel Santos/Barcroft Images)

An Indian woman wrapped in a shawl travels with others on a bullock cart on a cold day at Jhansi district, in Bundelkhand, India, Monday, December 29, 2014. Most parts of north India Monday continued to shiver under biting cold with the mercury dipping several notches. (Photo by Rajesh Kumar Singh/AP Photo)