In proof of the fact that our oceans remain pitifully under-explored, another underwater city was discovered off the coast of India. The site is apparently extremely large, and may have been constructed before the last ice age, more than 5,000 years old. For comparison, the Egyptian pyramids, some of the first large-scale structures built with stone, were constructed around 2700 BC, or 4700 years ago. (Courtesy of Dr. Kahle)