Klementinum’s Baroque Library

Clementinum is Prague's second largest building complex after Prague Castle and houses what many would say is the most beautiful library in the world. It has some absurd history. Albert Einstein held lectures here. Mozart played numerous times here.

Among the 27,000 old printed works are Kepler's writings with his handwritten dedication to his friends, the dean and other Prague university professors. The Jesuits founded Clementinum in 1556 and named it after the former Dominican monastery of St Clement from 1227, where they settled. In 1775, meteorological data began to be collected here regularly making Prague a place of the oldest continuous meteorological observations in Europe.

Well worth a pop in next time you're in Prague.