The Jewish Museum Berlin covers two millennia of German Jewish history. It consists of two buildings. One is the old Kollegienhaus, a former courthouse, built in the 18th century. The other, a new addition specifically built for the museum, designed by Daniel Libeskind. This was one of the first buildings in Berlin designed after German reunification. The museum opened to the public in 2001. The building is a twisted zig-zag and is accessible only via an underground passage from the Berlin Museum's baroque wing. A "Void" an empty space about 66 feet (20 m) tall, slices linearly through the entire building. A second underground tunnel connects the Museum proper to the E.T.A. Hoffmann Garden, or The Garden of Exile, whose foundation is tilted. The final underground tunnel leads from the Museum to the Holocaust Tower, a 79 foot (24 m) tall empty silo; its only light comes from a small slit in its roof.