Much of the material has been loaned and donated to the museum from local branches and individuals
Brecknock Museum, along with Girlguiding Breconshire are holding an exhibition celebrating 100 years of the Girl Guides.
The display includes a variety of Guiding, Brownies and Rainbows memorabilia spanning the the last century.
Much of the material has been loaned and donated to the museum from local branches and individuals.
The exhibition is on display at the Brecon-based museum until 13 June.
It includes uniforms, photographs, personal effects and a reconstructed camping scene.
Girl Guiding UK is Britain's largest voluntary organisation for girls and young women, with more than 600,000 members in the UK and millions more world wide.
The Guides has always appealed to a wide variety of girls from a variety of backgrounds and upbringings.
In 1937, the Queen became a Guide, her sister, Princess Margaret enrolled as a Brownie and their mother became the Patron of the Girl Guides.
Since Lord Baden-Powell established the Girl Guides in 1910, millions of girls, from all walks of life, have made the Guide promise world wide.
Abigail Kenvyn, Assistant Curator of Brecknock Museum and Art Gallery, said: "This exhibition is a celebration of the last 100 years of Guiding, displaying a wide range of memorabilia from its rich history.
"It is certain to rekindle fond memories of guiding adventures in girls of all ages."