Welcome to city of Williston, North Dakota - Photo Williston welcome highway sign City of Williston. Broadway street - East Dakota Parkway. Attractions in and around Williston: Buffalo Trails Museum - Fort Buford State Historic Site - Fort Union Trading Post National Historic Site - Frontier Museum - Missouri-Yellowstone Confluence Interpretive Center - Theodore Roosevelt National Park - North Unit. Pick up the trail of America's greatest legends in North Dakota, and you'll find yourself in a legendary adventure of your own. Lewis and Clark, Sakakawea, George Custer, Sitting Bull and Theodore Roosevelt lived out larger-than-life adventures here. Whether you follow in their footsteps and rediscover the past or blaze your own trail and discover what makes North Dakota legendary today, you'll find wide-open spaces and wide-open fun!