Round Tower (Rundetårn)

Built in the 17th century, Copenhagen’s Round Tower (Rundetårn) stands as a historic landmark and is said to be the oldest functioning observatory in Europe. Located in the heart of the city, the tower offers a unique spiral ramp that winds its way up to the top, providing visitors with panoramic views of Copenhagen. While it no longer houses a team of scientists, the tower remains a popular spot for amateur astronomers who visit at night, and tourists who come during the day to enjoy the sweeping city vistas.