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26Ajanta Caves
Ajanta Caves in India are 29 caves joined together, which are filled with paintings from over 3 religions (Hinduism, Buddhism, and Jainism), which were constructed in 520 B.C. They cave system is spread over an area of 8,242 hectares, making it one of the largest man-made cave structures ever built.
27. The Vrtoglavica Cave in Slovenia has a 600-meter vertical drop, which is the longest such drop in the world.
