Annapurna Himalaya Region, Dhaulagiri & Mustang Region, Langtang Gosainkunda Helambu Region,Everest Upper Valley & Everest Lower Valley Region is the most popular trekking regions of Nepal. F...
1. Himalayas. Most people travel to Nepal to see the mountains. If they can hike, the most popular treks are the Annapurna Circuit and the Everest Base Camp trek. Other people take scenic mountain flights or shorter treks, including Annapurna Base Camp. More adventurous travelers can take treks of much greater remoteness and difficulty.
2. Jungle. Nepal has some beautiful jungle with large wildlife including tigers and rhinos. There is good tourist infrastructure in the jungle.
3. Religion. Nepal has many important places in Buddhism and Hinduism and practitioners of those religions travel long distances to Nepal.
â–ªTeru Teru Bouzuâ–ª [̉³̀¸̉²̀¸̉³]
*Pokhara
*Chitwan zoo
*The Himalayas
*Temples and shrines in kathmandu && Lumbini.
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Here is the answer to your question.
http://www.visitnepal.com/travelers_guide/
Captain.
The ABC- Annapurna Base camp, trekking is fun here.
Mount Everest
Pokhara
Thamel- Ultimate place to chill in Nepal
Bhaktapur, See centuries old building and lifestyle first hand
Chitwan- The Chitwan National Park
These are the most famous ones. ;)