Zhangye National Geopark
It is located in Gansu China and is known for one of the most colorful rocks in the world. It covers around 320 square km area. They are the result of several minerals and sandstone combined in several millions years ago. Wind and rain made the extraordinary shapes with respect to time. Due to its colorful appearance it becomes tourist spot in short time.
Pamukkale
Pamukkale, meaning "white cotton" in Turkish, is known for travertine terraces formed by calcium carbonate left by the flowing water. Hot spring water flowing through travertines. Because of the rich presence of minerals, the water in travertines is believed to cure many diseases but you are not allowed to go into the water wearing shoes. People have taken baths here for thousands of years.
Santa Ana volcano
Located at 2381-m Santa Ana volcano is the highest and the most active volcano in El Salvador. One should walk along the rim of the crater very carefully. A slight mistake could throw down a person by his self a couple of hundred meters into the Sulphurous boiling lake. Santa Ana volcano never sleeps. Inside the ring of nested calderas, a green boiling lake releases clouds of fumes into the air. From above it looks like the eye of a volcano which is full of rage but is holding back its emotion.
Door to Hell
Door to hell is a 230 ft wide crater in the middle of a desert in Turkmenistan. In 1971 a team of scientist came to this area to find natural gas reservoir and for this purpose they set up drilling rig. Soon the site of the drilling rig collapsed and the release of methane gas started so the engineers thought its best to burn it off. Initially scientist believed that it would finish in few weeks but now more than 4 decades passed by and it still burning.
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