Each year a a group of individuals receive news coverage (for example here) for attempting to enter the Har Habayit to bring the Pesach Offfering. (They are stopped by the police.) Since the Korban Pesach requires giving blood on the Altar and the Altar is not standing, nor do the intruders seem to carry an altar with them; how can they bring the Korban Pesach? Do they expect the Mizbeach to fall from heaven? Or is it simply a publicity stunt? Or is there possibly an halachic opinion that does not require use of the Altar?