The U.S. Marshals Museum received more than $50,000 in donations on Giving Tuesday after an anonymous donor matched a board member’s $25,000 challenge.

The two donations alone more than doubled the gifts received by the U.S. Marshals Museum in the past three years of Giving Tuesday. The board member also chose to remain anonymous. Two gifts of $10,000 each were received last year during Giving Tuesday and about $800 came in 2015 on that day. The year 2014 was lower because of a variety of development efforts already in progress such as a gala and commemorative coin, according to Alice Alt, vice president of Development for the U.S. Marshals Museum.

Alt said “countless” donors have contributed this year and roughly $20 million remains to be raised to reach the $60 million goal for building construction and operations. Site work began in September and construction is expected to begin in the spring. The museum’s board of directors intends to open the museum on Sept. 24, 2019, to coincide with the 230th anniversary of the U.S. Marshals Service.