Descriptive Essay

Mecca, the holy place of Muslims in Saudi Arabia, is one of the most crowded city cities in the world. More than 8 millions of Muslims eight million Muslim people from many countries visiting visit Mecca annually. Known as the city that never sleeps, it is a small historical city surrounding surrounded by mountains. That is why the land in this city, especially that near the Holy Mosque,
costs $500,000 per sq metre.

Unlike the cities in Saudi Arabia, the streets in this city filled are full of pedestrians. No one can enter the city by the car, except the buses and taxi cars that transport the passengers from the airports in nearby cities to their hotels .
This city contains 50 fifty (When writing essays, it is better to spell out numbers unless they are very large, like 255,699) wide networks of tunnels for the cars and buses, and as well as 10 ten for pedestrians.

The most main things that grab the visitors' attention, besides the Holy Mosque, are the height high towers that surrounding it. and The clock at the top of "Mecca Clock Tower", (a space is needed between the comma and the next word) the height of this tower, is 801 (This number is large enough that it is okay to leave it as it is) meters. Most of  these towers share the same features. First, (A space is needed between the comma and the next word) the first four floors contains contain stores and restaurants so the people do not have to leave the towers. Second, most of the hotels in these towers are four or five star hotels. There are is an (The word "a" is used before words that start with consonants, but "an" is used before words that start with vowels, unless a word starts with a consonant but sounds like a vowel, such as "honest") intense competition between among ("Between" is used to compare two things, while "among" is used to speak about three or more things) the hotels to provide the best services. For example, they care a lot about the diversity of foods that provided in the buffet to suit all the people from the different races.
Also, they care about other things, such as the numbers of the elevator that should be wide and fast (I'm not entirely sure what you mean by this phrase, so I'm unsure how to correct it.  It's somewhat unclear) , (This comma should be next to the word "fast", without a space between) and, most importantly, providing transport to the airports . (This period should be next to the word "airports", with no space between) 
There is a famous restaurant in this city,which known for fast-food, that primarily sells tasty broasted chicken and shrimp, with a variety of sauces in at a lower price. The crowd at this restaurant is unbelievable. This restaurant is considered as one of the best non-American fast-food restaurants non american in the world, according to the CNN network.

I enjoyed reading this!  America also has a city that never sleeps, New York City.  I hope you continue to write and improve your English.  If you have any questions about these corrections, let me know!