Knowledge may be roughly divided into two kinds:that comes from books and that fron actual experience.The latter is no less valuable than the former.The best means for getting knowledge of the latter kind is travel.
Only by travel can one see things outside one's hometown. For example,probably you have heard and read about Beijing and have even seen many pictures of it,but you can only have a very vague idea of it unless you have personally visited it.
Travel is also good for health.One who keeps himself indoors all day long will fall sick.When one is travelling,one gets exercise and fresh air.
Nowadays with all the comforts available in route and the thrilling speed,many people travel to other places and even other countries just for the sake of pleasure and sight-seeing.
In short,travel is beneficial in more than one way.