A chemical process called carbonation, which helps seal cracks, could help explain why many ancient Roman structures are ...

One of the many marvels of the Roman world is that some of its buildings are still with us. But why have they lasted for so ...

Known as a “genius,” the protective spirit or deity was believed to bring good fortune and prosperity to a particular person, ...

An earlier version of this page included retrofit information from the city of Los Angeles that contained numerous errors. This story has been updated and buildings from Los Angeles have been removed ...