Doors Open Ottawa celebrates its 10th Anniversary

Watson's Mill in Manotick was one of dozens of buildings participating in this year's Doors Open Ottawa. The mill was built in the 1860s.

The Hopper Boy, a large revolving rake used to cool the grist. 

Flour is still milled at Watson's Mill on most Sunday afternoons and is available for purchase.

Interior view of the Blackburn apartment building on Somerset Street. The building was completed in 1936 and contains 30 apartments.

The skylight of the Blackburn apartments as seen from the rotunda.

The green roof of the C.D. Howe building on Queen Street, with the Parliament Buildings in the background. Environment Canada studies have found that green roofs reduce both heating and cooling needs by approximately 25 per cent.