The Tajmahal

The Tajmahal is situated at the bank of Yamuna river. It was built by the Shahjahan in 16 century. It took 20 years to build with the labour of 20 thousands labourers. Not only the Indian artisans but the artisans from abroad also were brought here to get it built. Cores of rupees were spent to build itget to built. It was made by the Shahjahan in the remembrance of his wife,the Mumtaj Begum. Thousands of visitors visit here everyday to see it. It was is made of white stone. It looks very beautiful with plenty of greenery around it. Night adds to beauty for to its look. It is one of  called the seven wonders of the world. We are proud to have it in our country.

The Tajmahal

The Tajmahal is situated at the bank of Yamuna river. It was built by the Shahjahan in 16 century. It took 20 years to build with the labour of 20 thousand labourers. Not only the Indian artisans, but the artisans from abroad also were brought here to get it built. Cores of rupees were spent to build it. It was made by the Shahjahan in the remembrance of his wife, the Mumtaj Begum. Thousands of visitors come here everyday to see it. It is made of white stone. It looks very beautiful, with plenty of greenery around it. Night adds its beauty. It is called one of the seven wonders of the world. We are proud to have it in our country.

[Good job.  Some of my modifications were to make the sentences more natural.  For instance 'visitors visit' sounds better (to a native speaker) as 'visitors come'.]

The Tajmahal

The Tajmahal is situated at the bank of Yamuna river. It was built by the Shahjahan in the 16th century. It took 20 years to build with the labour of 20 thousands labourers. Not only the Indian artisans, but the artisans from abroad also were brought here to build it get it built. Cores of rupees were spent to get to build built it. It is made by the Shahjahan in the remembrance of his wife the Mumtaj Begum. Thousands of visitors come visit here every day to see it. It is made of white stone. It looks very beautiful with plenty of greenery around it. Night adds to the beauty to of its look. It is one of called the seven wonder of the world. We Indians are proud to have it in our country.

~~~Very good. I changed "visitors visit" to "visitors come" because it simply makes the sentence easier to speak and understand. Grammatically, both are correct. Also, I removed the use of "here" and included "we Indians" in the last sentence. This is because you never previously stated that you are Indian, that you live in India, and that you are representing Indian people. If someone were to read this, they would most likely understand what you say, but it is always good to either: 1) State who you are and where you are (when you use words like "here" and "we"), or alternatively you could just 2) Replace the word "here" with "India" (the location) and do not use words like "we" (so let the reader assume that Indians are proud to have it). I have left some fairly complicated English concepts for you because you seem to have excellent English skills. I hope for the best from you.~~~