10 of the world's most amazing rock formations

5. Chocolate Hills, Philippines



A world renowned attraction on the central Filipino island of Bohol, the contrasting beauty of the Chocolate Hills is hard to appreciate on just one trip. Normally coated in verdant grasses, the 1200-plus conical mounds turn a rich brown during the dry season, when the greenery withers away into dirt. Their exact origin remains unclear, but local legends posit everything from the tears of a giant to the faeces of an enormous buffalo.