The apices of the triangle are Parliament House, the seat of government; the Defence Headquarters at Russell; and City Hill, representing the civilian part of Canberra.
Consistent with Walter Burley Griffin's Garden City design, the National Triangle is characterised by streets lined with large deciduous trees, and buildings set in expanses of grassed parkland.
Other buildings significant to the design and symmetry of the Triangle are the High Court and the National Gallery, located near Lake Burley Griffin, forward of Old Parliament House and to the east, and the National Library and Questacon located forward of Old Parliament House and to the west.
The National Carillon, a gift from the British government which marked 50 years since the establishment of Canberra, is located on Queen Elizabeth II Island.
The National Triangle has several dining and recreational facilities which cater to the large number of departmental employees, tourists and Canberra locals.
The Café in the House has recently developed into a trendy bar popular with younger public servants on Friday evenings.