"Mysterious India" refers to a wide range of enigmatic places and unexplained phenomena, from the haunted Bhangarh Fort in Rajasthan to the "Skeleton Lake" of Roopkund in Uttarakhand, which is littered with ancient human remains. Other mysteries include the unusual number of twin births in the village of Kodinhi, Kerala, and the unexplained mass bird suicides in Jatinga, Assam.