they have been hard at work on a new expansion of the cleveland natural history museum.
When I visited a few years ago they were starting construction on this renovation and addition. It is interesting that the cone-like structure is existing and being surrounded by new features.
Museum: Portland Art Museum (Main Building)
Location: Portland, Oregon
Architect: Pietro Belluschi
Completed: 1932 (Ayer Wing), 1939 (Hirsch Wing), 1970 (Hoffman Memorial Wing), 2000 (renovation and expansion of Hoffman Memorial Wing)
Museum: Klondike Gold Rush National Historical Park Visitor Center
Location: Seattle, Washington
Architect: Hetherington and Clements and Co.
Completed: 1889 (as Cadillac Hotel), 2005 (as visitor center)