Copper-Roof Palace

The Copper-Roof Palace is an 18th-century palace in Warsaw, Poland. It takes its name from the copper roof, a rarity in the first half of the 18th century. Since 1989 the Palace has been a branch of the Royal Castle Museum.The palace is contiguous with Warsaw's Royal Castle, and down a slope from Castle Square and Warsaw's Old Town. Beneath the palace, a 17th-century lodge still exists.

Source: Wikipedia