You can now scale the tower in Glasnevin Cemetery for the first time in almost half a century.
The landmark has been reopened to the public, making it the tallest building you can climb in Dublin.
The round tower was built in 1855 in honour of The Liberator, Daniel O'Connell.
An explosion in 1971, allegedly in reaction to the blowing up of Nelson's Pillar on O'Connell Street, destroyed its staircase.
Now after four years of painstaking work, it's been restored according to its original plans and is open to the public.
It's about as high as the Wellington Monument in Phoenix Park and 40 people an hour will now be allowed to scale the 198 steps.
John Green from the Glasnevin Trust says there are unrivaled views of the city.
"There are four windows up there, facing north, south, east and west and we have pictures of what it looked like around 1900 so you can compare the difference between Dublin now and then. You can look down on Croke Park or Dublin Port and up to Clontarf.
A time capsule has been placed by students from the local O'Connell School in Glasnevin to mark its reopening.
It's hoped the O'Connell Tower will be come a must see tourist attraction for people visiting Dublin.
Tours will begin from tomorrow (Saturday 14th April) and will initially run from 1 to 3pm. You can get tickets here.