Visitors can look down over the remains of the ruined abbey and remaining buildings that mark the area where England's last Anglo-Saxon king, Harold, tried and failed to hold the line against the invading Normans.
There is dispute over the manner in which Harold died, whether, as all schoolchildren learn, he got an arrow in the eye, or as some historical sources say, he was hacked to death - or both.
But a new assessment has at least revealed where in the ruined church, which is said by 12th-century sources to be built on the site where Harold's body was found among a pile of corpses, the altar that marked the exact spot of his death was put.
As a result, the memorial stone has been moved a short distance to the east.
Battle Abbey is hosting a temporary exhibition in the gatehouse to bring the day-long fight and its preparations to life, while carved oak figures of archers, warriors and Norman cavalry are dotted around the grounds where battle raged 950 years ago.
Roy Porter, senior properties curator for English Heritage, said the charity had reinterpreted Battle Abbey as part of the 950th anniversary commemorations of the Battle of Hastings.
"We want people to come here to enjoy the remains of the medieval monastery but also to come away with a much better understanding of what actually happened here on October 14th, 1066.
"So we're allowing people access for the very first time to the roof of the gatehouse, so they can look out across the landscape of the battlefield and see how it sits within the wider landscape of this part of Sussex."
English Heritage's commemorations have also including creating and tweeting from Twitter accounts for the major players of the fight for the English throne and an arrow hunt for 1066 arrows across its properties, with prizes for the finders.
- PA