There are a great many countries that were never conquered by the Ottoman Turks. Russia, China, Australia, and many more. You might narrow this down a bit by asking what country did the Ottoman Turks attempt to conquer, unsuccessfully. That was Austria.
Vlad didn't conquer anything, he defended Transylvania, Wallancia, and Moldavia against the advance of the Ottoman Turks.
The Ottoman Turks attempted to conquer the city From April 6,1453-May 29, 1453, when the siege ending with the Turks conquering the city.
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The Ottoman Empire was founded by Oghuz Turks under Osman Bey in 1299. Some of the present day countries that are located in the same area as the Ottoman Empire are: Egypt, Albania, Romania, Bulgaria, Yemen.
The Byzantine Empire had been growing steadily smaller and weaker for centuries, but it was finally defeated altogether by the Ottoman Turks in 1453.