- Gagarin's launch pad

- Dried-up salt flats in the northern Aral Sea

- Surface-to-air missile sites in Kazakhstan

- Both southern tips of Sakhalin (a right bugger to get to by land, I'd think)

- The Kolokol volcano group on Urup, southernmost of the Kuril islands (must be just about the least visited place in Russia)

46S might be fun too: Patagonia, the southern Andes, the fiords of southern Chile, the fiords of southern New Zealand, the Crozet Islands, Marion and Prince Edward Islands. Stock up in Dunedin and Comodoro Rivadavia as they probably have the only shops on that line of latitude.