Step inside the former Royal Boat House, an early-17th-century building once part of Christian IV's harbor complex, and you'll find the Dansk Jødisk Museum (Danish Jewish Museum; jewmus.dk; adult/child 100kr/free), with arresting geometric design by Polish-born Daniel Libeskind. The zigzagging floors and walls are intended to create the unsteady feeling of being aboard a boat. It takes you through history, as well as telling the story of how over 90% of Danish Jews were evacuated to Sweden over two nights in 1943.
You'll find the museum entrance in the gorgeous Royal Library Garden, right behind the Kongelige Bibliotek (Royal Library).