Noah's Ark is the vessel in which he rode when  God spared him and his family, and many anmals from a world-engulfing flood. The story of Noah and his ark is found in similar deluge stories can be found thoughout the middle East, Asia and Africa. All these stories have the elements of a man building a watercraft, putting many animals in it and surviving a great flood with his family.  First, we should note that the word "ark" means a box, not a boat, no matter what you have seen illustrated.
     For a thousand years, people have claimed to have found "Noah's Ark".  Some say that it is 4500 years old, others,10,000. According to the Bible, the ark was made of wood, Why would any suppose that a wooden object would survive for more that 4000 years? If the Earth had been completely flooded and they were trapped on a mountain top, wouldn't they have used the wood of the ark to light fires and to construct tools and homes? It is nonesense to assume that any large part of the ark would survive to this day  

   In Genesis we find the story of Noah and his ark (a box),  The story in Genesis is repeated, with variations, in the Quran, where the Ark appears as (Arabic) Safinat Nuh "Noah's boat" and al-fulk.  Zoroastrian scriptures tell of Yima and his vara ( a large square enclosure),  the Sumerians wrote about Ziusudra and his great ship, in Southwestern China we find the story of Du-mu and his hollowed out log, in New Hebrides there is Qat and his great canoe, Michoacan people tell of Tezpi and his great vessel, the Masai have the legend of Tumbainot who built an ark of wood, the Loyalty Islanders have Nol and his canoe, there is the Hindu lengend of King Manu and his great boat, the Hawaiians relate the story of Nu'u, in Eastern Siberia we hear of Noj and the iron vessel of God,  The ancient Assyrian scriptures speak of Utnapishtim who built a large boat, the Babylonian records relate the story of Atrahasis whu built a box, and then there are the Chaldeans with their story of Xisuthrus and his giant vessel.    

     The structure of the Ark was given to Noah by God. The ark was 300 cubits long, 50 cubits wide, and 30 cubits high. This would result in ark dimensions of 600 ft x 95 ft x 55 ft, or roughly the size of an aircraft carrier. It has a door in the side, and a tsohar, which may be either a roof or a skylight. It was made of gopher wood, a word which appears nowhere else in the Bible - and divided into qinnim, stalls. The finished vessel was smeared with koper, meaning pitch or bitumen.
    We should note that  Noah did not land on Mt. Ararat. He landed on "the hills of Ararat". Ararat has been identified as the territiory south east of the Black Sea in Eastern Turkey. If all the glaciers in the world were to meltm and the Mediterraen Sea empty itself into the Black Sea, the water level of the Black Sea would only raise about 300 feet or so, not the 1300 feet necessary to place it atop  the modern Mt. Ararat.  He built a large raft, put walls and a roof on it, maybe a couple of decks, and moved in his farm animals(perhaps a hundred), food and animal feed.  The family (maybe a dozen people or so) lived on board the raft until the dam broke. The raft floated and drifted eastward to finally come to rest on some of the higher hills in Ararat., maybe 200 or 300 feet higher than where he had once lived- and maybe fifty miles eastward.
     He survived when thousands perished.

     Searches for Noah's Ark have been made from at least the time of Eusebius (c. 275–339 AD), and believers in the Ark continue to search for it in modern times, but no confirmable physical proof of the Ark has ever been found. No scientific evidence has been found that Noah's Ark existed as it is described in the Bible.  

     More significantly, there is also no evidence of a global flood, and most scientists agree that such a ship and natural disaster would both be impossible.  Some researchers believe that a real (though localized) flood event in the Middle East could potentially have inspired the oral and later written narratives; a Persian Gulf flood, or a Black Sea Deluge 7500 years ago has been proposed as such a historical candidate