What important discovery did four teenagers make at Lascaux's France in 1940?

In 1940, four teenagers discovered a series of prehistoric cave paintings in Lascaux, France, dating back approximately 17,000 years. The artwork features over 600 images, including animals like horses, deer, and bison, showcasing the artistic skills and cultural practices of early humans. This discovery provided significant insights into prehistoric life and sparked widespread interest in cave art, leading to further archaeological studies. Lascaux is now a UNESCO World Heritage site, although access to the original cave is restricted to preserve the artwork.