Mosaic Pieces
Welcome to the complete Maryland Mosaic.
The Mosaic is not presented chronologically but presents a randomized selection of Mosaic Pieces to spark your interest in a particular event or person. If you would like to have a more ordered chronological overview, use the six fixed time period options on the right of the screen to get a more immediate picture of an historical period. You can also explore by county or by category. Our predefined categories, tags, counties and chronological brackets will help you see links between the Pieces.
The collection has over 140 firsts, including events, people, places, objects, documents or buildings that are unique to Maryland and to the nation. The Mosaic is part of Maryland’s contribution to the U.S. 250th anniversary in 2026. It covers the period from 1776 to the present. You will find at least one Piece for every county and Baltimore City, making this a statewide project.
Abolitionist Martha Ellicott Tyson publishes first biography of Benjamin Banneker
Quaker abolitionist Martha Ellicott Tyson knew Benjamin Banneker when she was a child. She publishes the biography in 1854.
A Gaithersburg observatory measures the earth’s wobble.
Edwin Smith opens an observatory in 1899 in Gaithersburg to measure the earth’s wobble as part of a six observatory worldwide survey.
A Catholic anti-Vietnam War group burns draft records in Catonsville
The Catonsville Nine, led by Catholic priests, burn draft records to protest the Vietnam War in 1968. Philip Berrigan is second from left, rear row.
A “Mud Machine” dredges Baltimore Harbor
A mud machine driven by horse power dredges Baltimore harbor from 1806 to 1819. Irish immigrants do the hard labor, becoming the early working poor.
“Underground railroad” term coined
Thomas Smallwood coins the expression “underground railroad,” in a newspaper column in 1842. Born a slave in PG county he teams up with Charles Torrey (pictured), a white clergyman, to help over 400 slaves escape through DC.
“Uncle Tom” is based on a Marylander
Josiah Henson, born in Port Tobacco, escapes slavery, leads a community and learns to read and write. He becomes the model for the title character in Uncle Tom’s Cabin, a nationally popular anti-slavery story published in 1852.
