Atrium is a large 1,000,000-square-foot (93,000 m2) retail and office complex in Toronto, Ontario, Canada. Atrium is located adjacent to Yonge-Dundas Square, and was built upon the former site of the former Ford Hotel Toronto, on the north side of Dundas Street West, extending from Yonge Street to Bay Street. The mixed-use building was constructed in 1981 with parking on the second and third underground levels and retail space street and concourse levels topped by an eight-storey office block that rises to 14 floors on the east end of the site and 13 on the west. As part of downtown Toronto's PATH network, Atrium's Concourse Level is directly connected underground to the Dundas subway station, the Toronto Eaton Centre south, across on Dundas Street. A now-closed underground tunnel connects the Atrium to the former Toronto Coach Terminal located west, across Bay Street.

Path is a network of underground pedestrian tunnels, elevated walkways, and at-grade walkways connecting the office towers of Downtown Toronto, Ontario, Canada. It connects more than 70 buildings via 30 kilometres (19 mi) of tunnels, walkways, and shopping areas. According to Guinness World Records, Path is the largest underground shopping complex in the world, with 371,600 square metres (4,000,000 sq ft) of retail space which includes over 1,200 retail fronts (2016). As of 2016, over 200,000 residents and workers use the Path system daily with the number of private dwellings within walking distance at 30,115.