On-a-Slant Indian Village is a remarkable historical walking trail near Mandan, North Dakota, featuring authentic reconstructed Mandan earthlodges at 514 feet elevation. This immersive 30-scene cultural experience along the Lewis & Clark National Historic Trail offers visitors a unique glimpse into the lives of the Mandan people who inhabited this village from approximately 1575 to 1781. Located at Fort Abraham Lincoln State Park, the site preserves one of the most significant Plains Indian archaeological locations in the region.