Some of Tucson's oldest homes will open to the public Saturday in a tour to support historic preservation.

It will be the first such tour of the Barrio Viejo Historic District in at least a decade, featuring six landmark properties that reflect Tucson's Mexican-American roots and its adobe architectural tradition.

"To be able to see a collection of these houses together in this way really is a very rare opportunity to experience Tucson's origins," said Demion Clinco, president of the Tucson Historic Preservation Foundation. The nonprofit organized the tour of this neighborhood, which features multifamily row houses, as well as Sonoran and Transitional architectural styles.

"It is the soul of our city, both architecturally and culturally," Clinco said.

The tour also features a bonus home built only about 30 years ago as an infill project that blends in with the surrounding homes.

The row house pictured above, which belonged to the Federico family in the 1880s, has never before been open to the public. The home features plank roofing made from shipping crates from Tucson's early merchants.

If you go

Tucson Historic Preservation Foundation Home Tour: Historic Adobes of Barrio Viejo.

• When: 10 a.m.-2 p.m. Saturday.

• Where: Self-guided tour starts at Simpson Street and Convent Avenue. All six historic adobe homes are within two blocks.

• Cost: $35. Tickets online at www.preservetucson.org and at Hotel Congress, 311 E. Congress St.; Bon, 3022 E. Broadway; Adobe House Antiques, 2700 N. Campbell Ave.

• Questions: email info@preservetucson.org