No.3 Olympic Sculpture Park, Seattle Weiss/Manfredi

The Seattle Art Museum decided to put its sculpture park on an old industrial site crossed by a busy road and a railway line. Marion Weiss and Michael Manfredi made the most of it with an intricate switchback pathway that draws nature, art and the city into a dynamic force field.

No.4 IAC Headquarters, New York Frank Gehry Partners

Gehry's exuberant building is an undulating, white glass mesa that uses his characteristic whiplashing lines in a subdued and legible way. The sculptural silhouette is actually a clear expression of the interior floor plates. They just happen to be madly inventive floor plates.