The First Unitarian Church in Baltimore, Maryland is a historic and significant landmark. It's the oldest building continuously used by a Unitarian congregation and has beautiful stained glass from Louis Comfort Tiffany's studio. The church also boasts a pipe organ donated by Enoch Pratt. It's famous for being the site of William Ellery Channing's Baltimore Sermon of May 5, 1819, which laid the foundation for the Unitarian denomination. Image source: https://www.reddit.com/