Abstract. Contemporary civilization needs diverse resources to maintain its form, such as agriculture, knowledge, engineering, infrastructure, and energy, of course. In terms of the energy, the nuclear power is the thickest column to support our present civilization. However, sometimes the bigger advantage you get means the bigger responsibility you embrace. The powerful source of energy, nuclear power causes the crucial side effect behind which is tons of nuclear wastes, which is highly radioactive. Fortunately, many countries which own nuclear power plants are already working on this issue but still, most countries have no specific back-up plan how to deal with these critical but inevitable burdens. Finland is the fore-runner in this field and the Onkalo nuclear waste repository is one of a kind in this important subject. Still, the Onkalo is in the middle of research and engineering level right now, but it will be face the cultural and architectural questions for the Onkalo soon. As an echo of this subject the Onkalo will face, I propose the public facility to fulfill the additional needs and purposes of the Onkalo. OMM-Onkalo Monumental Museum which I am proposing will be the one of options for these demands. It can be a museum to memorize the place, the facility to maintain the place, the shelter to protect the place, and the hub to connect present to future.