City Hall Square is Copenhagen's largest square. The City Hall building is recognizable by its ornate brick front, clock tower, and the gilded statue of the city’s founder, Bishop Absalon, over the front balcony. The hall was built in the National Romantic style, which was popularized by the architect Martin Nyrop. His design is inspired by the City Hall in Siena, Italy.

The round tower is a 17th century astronomical observatory that is part of the Trinitatis Complex, which includes the Trinitatis Church and an academic library for the neighbouring Copenhagen University. The library was opened in 1657 and once housed the university’s entire collection — around 10,000 books. Instead of stairs, the tower features a ramp that spirals to the top of the structure.

Rosenborg Castle was one of the many architectural projects commissioned by King Christian IV. The architecture of the castle is in the Dutch Renaissance style of the seventeenth century, which is characterized by high gables and spires. After its completion, the castle continued to be expanded, not reaching its current state until 1624

Marble Church has the largest church dome in Scandinavia. The official name of this majestic structure is Frederiks Kirke , or “Frederik’s Church,” after King Frederik V. In 1748, King Frederik began planning the construction of a grand city district called Frederiksstaden.

The Amalienborg Palace is the current residence of the Danish royal family. The first palace was built between 1669 and 1673 by Queen Sophie Amalie, the wife of King Frederik III. The current Amalienborg Palace was designed to be the crowning jewel of the district of Frederiksstaden . Frederik V dismantled the existing palace and in its place constructed the octagonal complex you see today.

The first theatre built in this location was built in 1748. It seated 800 audience members and employed eight actors and four actresses. Performances c onsisted mainly of French comedies. This original theatre proved too small for the city of Copenhagen, and in 1774 it was rebuilt for a larger audience. The Royal Danish Theatre became the home for all the performing arts, including ballet, opera, and the royal orchestra.

Christiansborg Palace has been built over the remnants of four previous castles. In 1167, Absalon constructed the first castle on the island, which stood for over 200 years. After the destruction of Absalon’s castle by the Hanseatic League, Copenhagen Castle was built over the ruins. This castle stood for several hundred years and is best known for its Blue Tower, which held Leonora Christina, the daughter of Christian IV, captive for almost 22 years.