Thunder Bay 's main tourist attraction is Fort William Historical Park which attracts 100,000 visitors annually .
Fort William Historical Park is a reconstruction of the North West Company 's Fort William fur trade post as it was in 1815 .
Thunder Bay 's main tourist attraction is Fort William Historical Park , a reconstruction of the North West Company 's Fort William fur trade post as it was in 1815 , which attracts 100,000 visitors annually .