A 2004 addition includes a large gathering area on the west side.

A new addition dedicated in August 2005 includes a children's area, community meeting room and art gallery.

The western addition to the district includes a little over 300 contributing structures, most of them single family homes.

The river segments proposed today as additions to the system would include more than 10,000 miles.

The addition will include a drop-in teen resources center and a meeting place.

The addition included a fireplace built to share the original chimney.

The most recent additions included a new science and music wing to the school's west end, which were completed in 2000.

This addition includes classrooms, the Library and the fitness center.

The 1908 addition included a second dome and space for a new 37 1/2-inch reflecting telescope.

Additions over the years include a connecting apartment built in the 1960's.