Yonghsi Fort has two levels. Above ground, you can see the artillery fort, commander's office and bedrooms. Below ground in the tunnels, there are 8 machine gun firing spots, 4 ammunition depots and a firefighting water storage area.To the right of the entrance is a visitor center open daily 8am-5:30pm. Half-hr guided tours (in Mandarin Chinese) start here at 10 and 11am, 3 and 4pm.