 Inaugurated by King Charles XIV John and still officially carrying his name, it was designed by the architect Fredrik Blom as a neoclassical octahedral temple inspired by the Pantheon in Rome, borrowing the coffered ceiling while substituting the oculus for the temple-shaped lantern light.On all sides, the plain white walls restored in 1998 are pierced by portals whose four pillars support semi-circular lunettes.Inside the cruciform exterior, the interior sheet of the wooden double cupola is supported by paired doric columns and rounded arches.