Located on the grounds of Dundurn National Historic Site, this museum preserves and shares the military history of Hamilton and area through exhibits, programs and events. The building, originally constructed as a gate house for Dundurn Castle in the late 1830s, was first known as Battery Lodge, being located on the site of a War of 1812 artillery emplacement.

Griffin House is a modest one-and-a-half-storey wood-frame residence that was built in the Georgian style with clapboard siding and six-over-six sash windows. Constructed by Englishmen in 1827, it was purchased by Enerals Griffin and his wife Priscilla in 1834 – both born as slaves in Virginia, but who escaped to Canada. On this site, with their 20 hectares (50 acres) of land, the Griffin family lived as part of the Ancaster community for 150 years. Today, Griffin House stands as a testament to the determination of African-American men and women who escaped slavery and found peace in Ontario. For Digital Doors Open, watch the video below to learn more about this fascinating property.

Fieldcote was built in 1948 as a private home on the outskirts of the former village of Ancaster. Today, as the village expands, it serves as a cultural heritage centre with an emphasis on local history and the promotion of fine arts. The idyllic setting is the perfect venue for music, with beautiful, landscaped gardens and walking trails.

Dundurn Castle is one of the finest examples of high regency-style architecture in the country. Constructed in the 1830s for Sir Allan Napier MacNab (railway magnate, lawyer and politician), the buildings deteriorated under subsequent owners, but were restored in the 1960s to their original splendour. Today, Dundurn Castle tells the story of the MacNabs and the people who served them.

Opened in 1956, the Dundas Museum & Archives is a private, non-profit museum that collects, interprets and celebrates the unique identity of the Valley Town. As part of Doors Open Hamilton, they welcome the public to tour its permanent galleries. As well, you can visit the historical c. 1848 Doctor's Office and the 1873 Pirie House.

The Imperial Cotton Factory, built in 1900, ran as a factory until 1972. It has been repurposed as the largest creative hub in the Hamilton area — with studios for artists, artisans, musicians, craftspeople and entrepreneurs. Film and television productions, photographers and special events are also drawn here. This year's Door's Open Hamilton is also the Cotton Factory's 10th anniversary.

This church — founded in 1876 as the Church of The Redeemer — was established in 2007 with the amalgamation of the parishes of The Redeemer and the Church of our Saviour, Stoney Creek (founded in 1919). See how the 1876 church expanded in 1952, view stained-glass windows and learn the story of the Dossal tapestry.

Battlefield House Museum, part of which dates to 1796, was once home to the prominent Gage family. Learn about the stories of the people who built the house and the ongoing efforts to preserve and restore it. Explore the Dunington Grubb landscape (which includes the impressive Battlefield Monument) and hike around a 13.8-hectare (34-acre) patchwork of meadow and forest.

Balfour House is Hamilton’s last great escarpment estate. Several prominent Hamiltonians have called it home since 1836, most recently the family of St. Clair Balfour. Owned by the Ontario Heritage Trust and managed by the City of Hamilton, the building and garden are spectacular. Exhibits related to the commitment to music of the Southam family will be on display.

The Auchmar Estate is considered to be the last surviving country estate on Hamilton Mountain. It was built for the Honourable Isaac Buchanan, a local Scotsman, entrepreneur, politician and civic leader in 19th-century Canada. Visit this Gothic revival manor house and learn about its storied past before strolling the walled and landscaped grounds that surround it. No parking on site.

Enjoy a look inside the Ancaster Old Township Hall. Built in 1871 by William H. Thuresson, it is one of the finest pieces of stone architecture in Ancaster – complete with original apron stage, hardwood floors, arched windows and historically accurate colours. It has undergone several renovations over the years, but the original character remains.