In India, caves have long been regarded as sacred places. Caves that were enlarged or entirely man-made were believed to be as sacred as natural caves. The sanctuary in all Indian religious structures, even free-standing ones, was designed to have the same cave-like feeling, as it is generally small and dark, without natural light. The oldest rock-cut architecture is found in the Barabar caves, Bihar, which were built around the 3rd century BC. Other early cave temples are found in the western Deccan; these are mostly Buddhist shrines and monasteries, dating between 100 BC and 170 AD. Originally, there were probably wooden structures associated with them, which would have deteriorated over time.