Everyone has such interesting sites! I want to go visit them all

I have ridden by and canoed from Fort Mandan where Lewis and Clark spent their first winter, met Sacajawea and that is where she had her baby, Pomp. It is a full scale replica of the fort. And down river (Missouri/Knife) is a rebuilt Mandan village with fully equipped earth lodges.

If you go the other direction from here you end up at the geographical center of North America - Equal distance to all beaches

Ride north from there and we have the International Peace Garden - you can take your picture standing in the US and Canada at the same time.

For the non faint of heart we have the Maah-Daah-Hey mountain bike trail. Vitals: 110.00 miles (176.99 KM) miles Steep At Times
This trail takes you through Teddy Roosevelt's old stomping grounds in the ND badlands
I have NOT ridden that.