Iran has taken a step closer to its goal of moving its capital away from Tehran to a new, as yet unbuilt location near the town of Qom. This seems like an extreme move but it's one that has been repeated throughout history - as far back as the Egyptian dynasties of the Middle Kingdom, in ancient China and many times during the Roman empire.
Sometimes there are practical reasons for capital-moving. In Iran's case it claims that Tehran, a city of 12 million people, sits on 100 seismic fault lines and is therefore a major natural disaster waiting to happen. There have been examples of relocations for practical reasons in history too. Constantine I may have chosen to build his 'Nova Roma' at Byzantium on the Bosphorus because it gave access to the Black Sea, and was also a good base for campaigns against the Goths. That the site of Constantinople lacked fresh water - 200km of aqueducts had to be built to provide enough - and that it was vulnerable to attack from the north west, were two weakness that Constantine overlooked.