I live in New England (USA) where I practice law.
On Wikipedia I primarily focus on articles dealing with my local historic sites and notable people:
Substantial contributions or new articles include:
List of oldest known surviving buildings (probably my most viewed), List of the oldest buildings in the United States, List of the oldest churches in the world, List of the last surviving American slaves
New England topics (history and culture)
Swamp Yankee, Little Ivies, Bates College, Stone-ender, Rhode Island Villages, Rhode Island History, Roger Williams (A Key Into the Language of America & The Bloudy Tenent of Persecution), Smith's Castle, White Horse Tavern, Rhode Island Historical Society, Rhode Island Greening, Haven Brothers Diner, Jonathan Edwards (Religious Affections & A Faithful Narrative), William West, National Register of Historic Places listings in Rhode Island and National Register of Historic Places listings in Massachusetts, etc.
West v. Barnes (first U.S. Supreme Court case), Van Staphorst v. Maryland, Collet v. Collet, Georgia v. Brailsford (1794) (jury nullification precedent), Ghen v. Rich (a law school favorite), Trevett v. Weeden, Stoddard v. Martin, Stewart v. Preston, Gold v. Eddy, Tomson v. Ward, Rhode Island Bar Association, Massachusetts Bar Association, associate attorney, reception statute, post road, legal clinic, Suffolk University Law School, Geo-fence warrant, etc.