Yes, the Garden of Eden still exists today, but we do not know where. The Garden is the place that God made for Adam to live in, and from where they were driven after The Fall. The entrance to it is guarded so that it cannot be found, but it is located in the Middle East near the four rivers of the area of Eden: Pishon, Gihon, Euphrates, Tigris. The location of the first two is not known. Furthermore, since the global flood, it is quite possible that the Tigris and Euphrates rivers are not in the same location as they were originally.
Furthermore, what possible effect could the global flood have had upon the garden? Did it wipe it out completely? Perhaps. But, in my opinion, since the garden is guarded by angels so no one can reenter it, I do not see how the flood could remove that necessity. The location is the issue and the location would not be altered by it being covered with water, though its relationship to other geographical markers could have been altered due to plate tectonic shifting during/after the flood. So, I assume that after the waters subsided, the garden re-grew and is still guarded by the angels.
“So He drove the man out; and at the east of the Garden of Eden He stationed the cherubim and the flaming sword which turned every direction to guard the way to the tree of life,” (Gen. 3:24).
The entrance to the garden is it guarded by cherubim so that people who might happen upon it would not be able to enter and thereby partake of the tree of life and live forever in their fallen state.
