The church Saint-Étienne-du-Mont | Paris

Located opposite the Panthéon and a stones throw away from is the historic public library Sainte-Geneviève.The vast collection of the Abbey of Sainte-Geneviève was in need of a home and it took seven years of construction after the architect Henri Labrouste delivered his unique design in 1839. The public, university library now holds around 2 million documents and the magnificent cast iron ceiling of the two storey reading room, is nothing short of breath-taking.