Also, some very cool video simulations of those trips. This clip is taken from the IMAX movie "Roving Mars."
The Spirit is a robotic rover on Mars, active from when it landed in 2004. The rover, after travelling 7.73 km (much beyond the planned 600m), became stuck in soft soil in late 2009, and its last communication with Earth was sent on March 22, 2010.
A formal farewell was planned at NASA headquarters after the Memorial Day holiday 2011, and was televised on NASA TV.
Thanks to IMAX, and to Norman Berke for tipping me off to this.