Why people visit Tibet?

Dear all, It is very difficult to book a train ticket to Tibet now? Why ? Why so many people go there! What can people see in Tibet?Thanks for answering!

Hi:Teran,About your questions:
1.Q:It is very difficult to book a train ticket to Tibet now? Why ? 
   A:The popularity of train travel to Tibet has resulted in the huge demand for train tickets among visitors. It's very difficult for individual travelers to get a ticket on their own. Reliable travel agencies can not guarantee successful booking. Chinahighlights recommends you fly into Tibet and return by a train.And the reason why Tibet Travel is so popular this year is because the railway to Tibet is founded this year.
2.Q:Why so many people go there?  What can people see in Tibet?
   A:Tibet, well-known as the Roof of the World and The Third Pole of the Globe is the perfect combination of grand highland sceneries and holy Tibetan culture.  Tibet is an eternal topic and dreams of so many people, with its unique high attitude, exotic culture, unique highland landscapes, and friendly people. Some  tours of China highlights can  takes you to see the highlight Tibet within the shortest time, including holy Potala Palace - the symbol of Tibet, JorkhangTemple - the destination for millions of pilgrimages, and many many more...  

Tibet is one of the few unspoiled lands on this planet but to enjoy the primitiveness of the region you have to overcome some physical problems such as the altitude sickness.