The actor visited Leavesden Studios with former Potter co-stars Rupert Grint, Warwick Davis and Evanna Lynch to check out the Making of Harry Potter exhibit before its official opening on Saturday (31Mar12).
The attraction features a creature workshop, a triple-decker bus and sets used in the eight-film series, including the Great Hall and Professor Dumbledore's lavish office.
And Felton, who played Draco Malfoy in the films, admits his trip down memory lane made him rather teary.
He tells U.K. talk show Daybreak, "I won't lie, it got pretty emotional yesterday. I walked through the Great Hall for the first time in three or four years. It hit me like a ton of bricks, to be honest with you. It's a house of many treasured memories. It all came back to me rather quickly...
"We were asking for years for wands, for broomsticks and they denied us - but with good reason. This is the reason they said no because everything is here. Everyone's wand, everyone's broomstick. It's quite a marvel how much stuff they managed to keep."
Grint, who played Harry Potter's pal Ron Weasley for 10 years, adds, "Leavesden Studios is such a special place, I grew up here, I went to school here. It's so great to see people going around the attraction and getting so excited."