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Dūkštos Stone (also called the Airėnai or Bradeliškiai marked stone) is a mythological stone in Vilnius district, standing in one of Lithuania's oldest oak groves near Dūkštos, 2 km northwest of Dūkštos village. It's a roughly 2 m long, gray, coarse-grained granite boulder with marks about 1 cm wide carved into its leveled upper surface, resembling letters or Greek script - no one has yet managed to decipher them. It's thought the stone may once have marked a land boundary, since similar boundary stones in Lithuania often bear carved equilateral crosses, though no reliable theory yet explains what these particular marks mean.