The museum collects, preserves, researches and classifies museum treasures connected with the life and work of the publicist, publisher, signatory of the Act of Tilsit, patriarch of Lithuania Minor, Martynas Jankus (1858–1946), as well as with the history of the Pagėgiai region and Lithuania Minor and the notable people of these lands.

Since 1999, the museum has been located in a small, restored printing house of Lithuania Minor from the late 19^th century, where M. Jankus, a public figure from Lithuania Minor and one of the editors of the first public newspaper for Lithuania Major Aušra, worked and later lived.

The museum displays personal items of Martynas Jankus, preserved by his family and donated to the museum; holds books and publications printed in the printing houses of Lithuania Minor; and exhibits many household objects and working tools of people from the 19^th and early 20^th centuries, illustrating the history of Pagėgiai region and Lithuania Minor.

The museum is surrounded by a painting garden of Lithuania Minor – an open-air painting gallery, which is expanded every year with professional works of art.