Doors Open Ottawa at the Diefenbunker 2026

Doors Open Ottawa at the Diefenbunker 2026

Descend into history, 75 feet underground, and discover unforgettable experiences.

The Diefenbunker is Canada’s most significant surviving Cold War artifact — it is an impressive four-storey underground facility that operated as the country’s central communications headquarters during the Cold War, ready at any moment in case of a nuclear attack.

Today, it is a one-of-a-kind museum and national historic site, preserving important Canadian Cold War stories and artifacts and welcoming visitors from all around the world. The Diefenbunker is a remarkable immersive history destination, offering a window into the past through award-winning exhibitions, tours, programs, events, and escape rooms.

Admission is free.

Stay tuned — more details coming soon.