FreeCanada's seat of government sits on a bluff above the Ottawa River, its Gothic Revival towers the most photographed skyline in the country. The grounds are free to wander, and in November the best way inside is a reserved tour of the House of Commons at West Block or the Senate, because the Centre Block and its Peace Tower are closed for a long renovation.
1.5-2 hours with a tourDetails → 
A glass-and-granite Moshe Safdie building above the Ottawa River holds the country's greatest collection of Canadian and Indigenous art, European masters and a whole reconstructed chapel. Louise Bourgeois's giant spider guards the entrance, and it is a short walk from Parliament Hill.

One of the best military history museums anywhere, set in a low, angular building at LeBreton Flats. It tells Canada's wars through personal stories, huge artefacts and a hall where, on 11 November, sunlight is designed to fall on the Unknown Soldier's headstone.

Across the river in Gatineau, Quebec, Douglas Cardinal's curving limestone building holds the Canadian History Hall, the soaring Grand Hall of totem poles and the best views back at Parliament Hill. Timed tickets are required for every visitor.
FreeA UNESCO World Heritage canal that turns into the world's largest naturally frozen skating rink, 7.8 kilometres through the heart of the city. It is a winter attraction, not a November one: the ice usually opens between January and early March, weather permitting.
1-3 hours (when open)Details → Ottawa's oldest and liveliest district, a grid of heritage streets and market stalls just east of Parliament Hill, packed with restaurants, bakeries, pubs and street art. A guided tasting tour is the easiest way to taste your way around.
FreeQuebec's big green lung just north of Ottawa, with lookouts, lakes and hiking trails twenty minutes from downtown. In November the parkways are closed to private cars and become a quiet place to walk, with winter skiing and snowshoeing coming soon.
Half to full dayDetails → A castle-like landmark in downtown Ottawa with dinosaurs, a vast mineral gallery, whales and a polar world. It is the best rainy-day choice in the city, especially with children.
A lantern-lit evening walk through Ottawa's old streets and shadowy corners, told with ghost stories, true crime and local history. It runs through the cold months, which is exactly when it works best.
About 1.5 hours$$Book on Viator → A guided walk through the castle-like hotel that has watched over Parliament Hill and the Rideau Canal since 1912, with the stories of the famous guests, the architecture and the Titanic connection behind its founder.
About 1-1.5 hours$$Book on Viator →