Four Lost Cities★★★★★
Annalee Newitz Fascinating look at how cities form, live and die, seen through archaeological discoveries at Pompeii, Angkor, Cahokia and Çatalhöyük.
Under Alien Skies★★★★★
Philip Plait A fun look at what it would be like to visit other planets or star systems, weaving together sci-fi scenarios, the science behind them, and the history of how those discoveries were made.
Note on dates: Yes, there are reviews on here that predate this collection. I've backdated my imported reviews to the time they were first published, whether it was on my own blog or on a store listing somewhere else.