In this buzzing world where nothing remains the same as it was yesterday, there is one BOOK, that hasn't altered even a single bit from the past 1400 years, and that book is the Holy Quran, revealed on prophet Muhammad (PBUH). Now, one must think that there are many things still extant today, so what's unusual about the existence of holy Quran? We would like to reflect on the Words of Allah, where He says:
"The Word of your Lord is complete, in truth and justice." (Quran, 6:115)
There are probably many factors that supersede Quran over these things. For a start, all those things that are still present today after hundreds of years are either a part of museums or are not in any way beneficial to mankind, other than being something from the past. Secondly, these things are in ruins or remains or have been widely altered by human hands. Whereas, Quran is a part of people's houses and is read and followed by a large population of Muslim community and the principles stated in this book have not become old and provide a great source of guidance for its followers. Additionally, Quran is a book that hasn't gone through any changes and its text remains original as Lord himself took the responsibility of its protection unlike the other writings which were human protected and do not exist in their original script anymore. Thus, Quran is the only literature that is not only safe from alteration but is widely read among the Muslim community.
To ensure such protection of The Holy Book, Quran has been preserved at two places, human mind and the pages of the book. So whenever an error finds its way to one place, the other comes for its correction. One cannot solely trust what reciter learned from heart without having its written verification, and similarly one cannot trust the writing without a scholar's verification.
So all in all, this kind of protection ensures Quran's originality with respect to its accuracy and purity from any kind of falsehood. This shows a practical example of the fulfillment of Allah's words to preserve the Quran in its legitimate form, and the Quran has certainly remained free from all distortions and corruptions faced by the earlier writings. As Allah says Himself:
"Surely, We have revealed the Reminder and We will assuredly be its guardian (against all corruption)." (Al-Hijr 15:9)