Poço Neversink, no Alabama, USA. É um buraco de calcário, com bordas cobertas por samambaias e cachoeiras. Tem 12 m de largura na parte superior e 30 m de largura na parte inferior, com 30 m de profundidade. É o lar de morcegos e várias samambaias raras e ameaçadas de extinção.
Neversink Pit- can't believe I'd never heard of this place until today! "Neversink pit is a limestone sinkhole in North Alabama. It’s one of the most-photographed sinkholes in the world because of its beautiful fern-covered ledges and waterfalls. The hole is about 40 feet wide at the top, but it expands to 100 feet at its bottom, which is 162 feet from the ground. Neversink is home to bats and several rare and endangered fern species."
Diavik Diamond Mine, Canada The Diavik Mine is a mine in the Northwest Canada. It goes to 240 meters below the surface. The Diavik Mineproduce 8 million carats or about 1,600 kg of diamonds every year.