The Museum for Architectural Drawing shows a private collection of architectural drawings from the 20th and 21st centuries. The building itself, opened in 2013, is part of the appeal, with a sharp contemporary design that suits the subject.
This is a specialist museum rather than a Berlin essential, but it is worthwhile for visitors interested in architecture, design, and how buildings are imagined before they are built. Check opening times before going, as smaller museums can keep limited hours.