The Biltmore Theatre chain was owned by the affluent Okun Brothers of Toronto; this was the first Biltmore Theatre constructed in Ontario. The street-facing façade of this classic building features smooth cut stone. Within the upper façade are recessed narrow windows with linear horizontal decorations. Today, The Biltmore is a live-music and entertainment venue with an unique 1940s-era upstairs lounge.

This memorial is dedicated to the men and women employed at the British spy training school located here during the Second World War. Over 500 special agents trained here to go behind enemy lines and “set Europe ablaze,” as dramatized in CBC Television’s X Company. During Doors Open, join expert Lynn Philip Hodgson for guided tours (terrain can be difficult).

The first mosque built in Oshawa is reminiscent of the Ottoman Empire. Ornamental crescent moons enhance both the main prayer hall dome and the dome atop the minaret. During Doors Open, guided tours and free refreshments will be available. In addition, a display will highlight Islamic history. Shoes are to be removed before entering the prayer hall.

This bandshell, set in downtown Oshawa, was a gift from R.S. McLaughlin, founder of General Motors Canada, in 1942 to the City of Oshawa. During Doors Open Oshawa, Brass Day workshops may be observed culminating in a concert at 1:30 p.m. Set in Memorial Park, there is also a cenotaph containing stones from allied nations.

Located on the south field of the Oshawa Executive Airport, this museum is home to Canada's largest collection of operational, historical military vehicles. View artifacts from Durham Region's Ontario Regiment from 1866 to present. Explore the Military Vehicle Conservation Centre. Check out the Tank Arena and maybe book a ride. Adjacent to the museum is Oshawa's first heritage conservation district.

The Regent Theatre, built in 1919, has a Georgian façade. One of Oshawa’s few remaining examples of this classically inspired style, the building was designated in 2001 and reopened in 2010 for the Ontario Tech University, as well as for community and cultural events. The restored interior boasts eye-catching historical details as well as chairs wired for the 21st century.

The original gallery (1969) was a square, stone, modernist structure. In 1987, architect Arthur Erickson designed an expansion that added an additional 3,345 square metres (36,000 square feet) to meet the growing needs of the gallery and the community. Erickson built his newly designed space around the existing structure, incorporating the original stone façade into the dramatic lobby design.

Built in 1867 in the Gothic revival style, Simcoe Street United Church is Oshawa's oldest church. It’s no wonder it has ghost stories to tell. Lancet-arched openings and a polygonal spire with pinnacles and dormers embellish the exterior. A pressed-tin ceiling, 11-metre (36-foot) high ornamental timber arches and a Casavant organ dominate the interior.

St. George's Memorial opened in 1924, the same year that Oshawa became a city. Designer Eden Smith considered this Gothic revival-style church, constructed of Credit Valley sandstone, his finest work. The buttresses and Gothic tracery are noteworthy, and the tower supports a 15-bell carillon. Come for a chiming concert at noon and an organ concert at 1:30 p.m.