The Observatory Museum is an intriguing study of Victorian-era cutting-edge science. The building was constructed by a watchmaker and amateur astronomer, H. C. Gulpin, who built a cupola above his shop to house his instruments. The museum contains a two-story pendulum and the only genuine Victorian camera obscura in the Southern Hemisphere. You can stand in the tower and watch what's happening in the town below—pretty useful if you've lost your companions.
10 Bathurst St., Grahamstown, 6139, South Africa