2. Turkmenistan

Being located in Central Asia, Turkmenistan is known for its famous huge hole filled with inexpiable burning gas or also known as ‘The Door To Hell’. This country has been one of the least visited in Asia because it has been isolated for decades. But, its isolation from the world retains its natural beauty making it a must-visit spot for thrill junkies. Just a heads up though, traveling alone to this country is strictly prohibited.