The pair went down to the Londonewcastle Project Space in Shoreditch to check out the Chasing The Sun: Oasis 1993-1997 exhibition, which is open to the public until April 22, reported Digital Spy.
They reportedly spent 45 minutes of their time taking photos with Oasis fans, before looking at the exhibits on display.
"We didn't get to see the exhibition - we got mobbed. But actually going in there with Liam and seeing what I did see was pretty emotional," Bonehead said.
"We looked at each other and went, 'Is it really 20 years ago?' Mental, man - time flies."
The exhibition is taking place to coincide with the forthcoming reissue of Oasis's 1994 debut album Definitely Maybe, which will be released on May 19.
Instruments played by the band on their early albums, unseen photographs and rare video footage are on display, alongside merchandise and a recreation of the Definitely Maybe album artwork.