The Wave (between Arizona and Utah - USA)
Antelope Canyon (Arizona - USA)
The Navajo name for Upper Antelope Canyon is Tse' bighanilini, which means "the place where water runs through rocks." Lower Antelope Canyon is Hasdestwazi, or "spiral rock arches." Both are located within the LeChee Chapter of the Navajo Nation.
Great Blue Hole (Belize)
Eye of the Sahara (Mauritania)
Blue Lake Cave (Brazil)
Giants Causeway (Ireland)
Hell Gate (Turkmenistan)
Wave Rock (Australia)
Chocolate Hills (Philippines)
Composed of around 1,268 perfectly cone-shaped hills of about the same size spread over an area of more than 50 square kilometres (20 sq mi), this highly unusual geological formation, called Chocolate Hills, is located in Bohol, Philippines. There are a number of hypotheses regarding the formation of the hills. These include simple limestone weathering, sub-oceanic volcanism, the uplift of the seafloor and a more recent theory which maintains that as an ancient active volcano self-destructed, it spewed huge blocks of stone which were then covered with limestone and later thrust forth from the ocean bed.
by "environment clean generations"