In the southeast region of the country of Brazil lies Guanabara Bay, off the coast of the major metropolis of Rio de Janeiro. It is the second largest bay in Brazil, but other than that there is nothing particularly special about it other than perhaps the large amount of pollution here. However, lying approximately 15 miles offshore, buried down in 100 feet of water across an area around the size of three tennis courts is a rather strange oddity. Here scattered along the bottom are various relics from ancient Rome, far from where they have any business being, and which have remained a baffling historical anomaly and conundrum that remains unsolved.
By Brent Swancer via Mysterious Universe