Rosenborg Castle, This is an iconic tourist attraction in Copenhagen. It has monarchy, jewels, castle and gardens. The visit inside the castle is worthwhile. The explanations are provided via QR codes, which I think is very modern and should be encouraged.
Denmark - the statue of the Little Mermaid in Copenhagen (via archer10). Facts about Denmark: Area: 43,092 sq km. The most southerly of the Scandinavian countries. See separate entries for Faeroe Islands and Greenland, which are autonomous regions of Denmark. Population: 5,481,283. Capital: Copenhagen. Official language: Danish. 13 languages.