Thaba-Bosiu is the evocative mountain stronghold of Moshoeshoe the Great, who first occupied the place in 1824. Good views from here include those of the Qiloane pinnacle (inspiration for the Basotho hat), along with the remains of fortifications, Moshoeshoe's grave, and parts of the original settlement.
Thaba-Bosiu means Mountain at Night, perhaps a memory of when the sight was first occupied. Another legend suggests that Thaba-Bosiu is a hill in daylight, but transformed into a mountain after dark. There's an information centre at the base of Thaba-Bosiu; an official guide will take you to the summit.