The 15th annual Doors Open Denver event will feature 59 properties this year.

Twelve of the properties on tour this year are new to the event, according to a news release. Tours are led by architects, historians, landscape architects or urban enthusiasts. Many of the properties are not frequently open to the public, the release said.

Tours of the properties are happening on Sept. 21 and 22. Tickets are $12 per tour. Ticket sales for the event benefit the Denver Architecture Foundation.

In addition to the tours, Doors Open Denver will host five different arts cultural experiences, including visual and performing arts at architectural locations in the La Alma-Lincoln Park neighborhood. The experiences will be announced early this month, according to the release.

For more information on the event, or to buy tickets, go to denverarchitecture.org.