The small island Utö in the archipelago of Stockholm is famous for its iron ore. The ore was mined as early as the 12th century, and so this is the oldest iron mine of Sweden. Today there are traces of the mining era in the deep waterfilled mine holes, the big piles of mine tailings and Lurgatan with its old houses, 18th century, where the miners lived. In the small mining museum, open every day in summer, you can learn about the history of the mines and look at interesting collections from that time.
References:The Clementinum is a historic complex of buildings in Prague. Until recently the complex hosted the National, University and Technical libraries, the City Library also being located nearby on Mariánské Náměstí. The Technical library and the Municipal library have moved to the Prague National Technical Library at Technická 6 since 2009. It is currently in use as the National Library of the Czech Republic.
Its history dates from the existence of a chapel dedicated to Saint Clement in the 11th century. A Dominican monastery was founded in the medieval period, which was transformed in 1556 to a Jesuit college. In 1622 the Jesuits transferred the library of Charles University to the Klementinum, and the college was merged with the University in 1654. The Jesuits remained until 1773, when the Klementinum was established as an observatory, library, and university by the Empress Maria Theresa of Austria.