Location
The steps were situated in the central part of Rome, leading from the Arx of the Capitoline Hill down to the Roman Forum. As viewed from the Forum, they passed down the Tabularium and the Temple of Concord on the left side, and past the Mamertine Prison on the right side. It is believed that the location of the steps roughly coincides with the current Via di San Pietro in Carcere, past the ruins of the Mamertine prison.
It is believed the stairs were built some time before the rule of Tiberius (14–37), as they were not mentioned by name in any ancient texts that predate this period. Their first use as a place of execution is primarily associated with the paranoid excesses of Tiberius' later reign.
Read more about this topic: Gemonian Stairs