The Centrifuge Accommodations Module (CAM) is a cancelled element of the International Space Station that would have provided controlled gravity for experiments and the capability to:
It was built by JAXA, but owned by NASA trading in a free launch of the Japanese Experiment Module Kibo to the Station. The CAM flight model along with the engineering model of the centrifuge rotor were manufactured. The CAM would have been attached to the Harmony module of the ISS. It was cancelled in 2005 alongside the Habitation Module and the Crew Return Vehicle, because of ISS cost overruns and scheduling problems in Shuttle assembly flights.
It is now on display in an outdoor exhibit at the Tsukuba Space Center in Japan.