Famously becoming one of Vietnam's seven UNESCO World Heritage Sites in 1993, the Imperial City of Hue has long been a must-see attraction for tourists visiting a hidden charm of Vietnam. The Imperial City of Hue was actually a walled fortress and palace belonged to the ancient city of Hue which was a capital city of the Nguyen Dynasty for 140 years date back from 1805 until 1945.
The grandeur architecture was planned to be built in 1803 by Gia Long an emperor who founded the Nguyen Dynasty. During 27 years from 1805 to 1832, the Imperial City of Hue was finally completed under the reign of Minh Mang, involving thousands of workers, millions cubic meters of rock and huge volume of burden workload. It is located on the northern bank of Huong River, turning South with total land area of 520 ha. Initially, the fortress was built solely by soil, only to be replaced by bricks afterward. Surrounding the city is the complicated canal system served not only as a protection but also as a waterway with nearly seven kilometers.
There are totally ten main majestic gates leading to the Imperial City of Hue, which can be divided into two main parts excluding houses and mansions: The Citadel and The Forbidden City. The former, the Citadel, served to protect the important palaces inside while the latter was where the emperor and the royal family stayed as well as the court's workplace.

Modern life is impossible without travelling. The fastest way of travelling is by air. With a modern airliner you can travel in one day to places which it took a month or more to get to a hundred years ago.
Travelling by train is slower than by air, but it has its advantages. You can see the country you are travelling through. Modern trains have comfortable seats and dining cars. They make even the longest journey enjoyable.
Some people prefer to travel by sea when it is possible. There are large liners and river boats. You can visit many other countries and different places. Travelling by sea is a very pleasant way to spend a holiday.
Many people like to travel by car. You can make your own timetable. You can travel three or four hundred miles or only fifty or one hundred miles a day, just as you like. You can stop wherever you wish - where there is something interesting to see, at a good restaurant where you can enjoy a good meal, or at a hotel to spend the night. That is why travelling by car is popular for pleasure trips, while people usually take a train or a plane when they are travelling on business.

There can't be many people (32) are unaware of e-mail, even if they have never actually sent one. (33) there are some similarities between e-mail and letters, there are also many differences. The first is that e-mail is delivered instantly, so it can be (34) very effective means of (35) when speed is important. This speed means that e-mail is more practical for communicating over large distances. Another difference is that e-mail tends (36) relatively informal. People are much more (37) to use language which they would consider unsuitable (38) a formal letter. Words spelled incorrectly in an e-mail (39) less likely to be checked than in a letter. One explanation for this is that an e-mail seems to be less permanent than something written on paper. We can be sure that the future (40) of e-mail will have all kinds of unexpected effects (41) the way we communicate.