Scientists in Spain discovered something remarkable inside vulture nests — a medieval sandal woven from twigs and grass. Researchers studied a dozen bearded vulture nests in Spain and found over 200 human artifacts dating back to the 13th century. The collection includes a painted leather mask, basket fragments, and even a crossbow arrow, all preserved thanks to the cool, stable cave environments where the birds nest. Experts say the discovery offers a fascinating glimpse into medieval life — and shows how nature can help preserve pieces of human history.