Diefenbunker: Canada’s Cold War Museum

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. Descend into history, 75 feet underground, and discover unforgettable experiences. Book your tickets for a free Highlights Tour, which will cover key areas in the Diefenbunker like the Blast Tunnel, the War Cabinet Room, and the Prime Minister’s Suite — ideal for first-time visitors to the museum!


In-person visiting hours

*Follow building health protocols.

  • Saturday, June 1 2024
    10am to 4pm

Virtual and 3D Tours

*Some content may not be available in both official languages.

A white garage-style building with a large fallout shelter icon on the front is tucked into the grassy hillside.
Exterior entrance to the Diefenbunker, photo credit: The Diefenbunker.

This Year for Doors Open Ottawa:

Registration is required- book your tour today! Tours will last approximately 30 minutes. Tickets must be reserved in advance at diefenbunker.ca, as there are designated entry times and limited spots available. No walk-up visitors will be admitted. Please arrive 15 minutes prior to your designated entry time for the start of the tour. Late arrivals may not be admitted. There will be no option for self-guided exploration of the museum. While admission is free for Doors Open Ottawa, we welcome donations to support our unique museum, national historic site, and independent charitable organization.

We look forward to welcoming you underground!


Construction date or date range
Museums, archives and historic sites

Amenities and features

  • Public washrooms
  • Free parking
  • Bike parking
  • Family friendly