As Langdon jogged across Platnéřská Street, he felt as if he were running through the pages of a history book. The colossal facade of Prague’s Klementinum loomed on his left, a two-hectare complex that housed the viewing tower used by the astronomers Tycho Brahe and Johannes Kepler, as well as an exquisite Baroque library holding more than twenty thousand volumes of ancient theological literature. This library was Langdon’s favorite room in Prague, and possibly in all of Europe.
