The Imagine Peace Tower (Icelandic: Friđarsúlan, meaning "the peace column") is a memorial to John Lennon from his widow, Yoko Ono, located on Viđey Island in Kollafjörđur Bay near Reykjavík, Iceland. It consists of a tall "tower of light", projected from a white stone monument that has the words "Imagine Peace" carved into it in 24 languages. These words, and the name of the tower, are a reference to Lennon's peace anthem, Imagine.
The Tower consists of 15 searchlights with prisms that act as mirrors, reflecting the column of light vertically into the sky from a 10-metre wide wishing well. It often reaches cloudbase and indeed can be seen penetrating the cloud cover. On a clear night it appears to reach an altitude of at least 4000m. The power for the lights is provided by Iceland's unique geo-thermal energy grid. It uses approximately 75 kW of power.
Buried underneath the light tower are upward of 500,000 written wishes that Ono gathered over the years in another project, called "Wish Trees". Ono plans to have the tower lit every year from 9 October, Lennon's birthday, through 8 December, the date he was shot. Iceland was selected for the project because of its beauty and its eco-friendly use of geothermal energy.