Visitor Complex includes two facilities run by the Astronauts Memorial Foundation. The most visible of these is the Space Mirror Memorial, also known as the Astronaut Memorial, a huge black granite mirror through-engraved with the names of all astronauts who died in the line of duty. Elsewhere on the Visitor Complex grounds is the foundation's Center for Space Education, which includes a resource center for teachers, among other facilities; and the Kurt Debus Conference Center. Heroes & Legends, which replaced the previous Early Space Exploration exhibit, houses the U.S. Astronaut Hall of Fame and several displays of artifacts. Among them is the Gemini 9A spacecraft, as well as a recreation of the Mercury Control Center using consoles and furniture relocated from the original building at Cape Canaveral Space Force Station. These were previously housed in the Mercury Mission Control facility, which was on the National Register of Historic Places, but it was demolished in May 2010 due to concerns about asbestos and the estimated $5-million cost to renovate the building after 40 years of exposure to salt air. Space Shuttle Atlantis In 2010, the center announced a US$100 million plan to house a retired Space Shuttle orbiter in a 10-story facility. On April 12, 2011, the 30th anniversary of the launch of STS-1, NASA announced that Space Shuttle Atlantis would be provided to the visitors center for display after its last flight on STS-135 and subsequent decommissioning. The exhibit officially opened on June 29, 2013, offering a nearly 360° view of the shuttle. Atlantis is positioned at a 43.21° angle with the payload bay doors open; a view only previously seen in space. The exhibit also includes a life sized replica of the Hubble Space Telescope, the Shuttle program's astrovan, Dr. Maxime Faget's Shuttle prototype from 1969, a large-scale slide mimicking the 22° slope of a Space Shuttle when landing, numerous astronaut training and Shuttle simulators, and other displays about life in space. On the ground level is the "Forever Remembered" exhibit, commemorating the 14 astronauts lost in both Space Shuttle Challenger and Space Shuttle Columbia disasters. "Forever Remembered" includes personal artifacts from the astronauts, two recovered pieces of the Shuttles, footage of the physical and emotional recovery, and the return to flight. This exhibit replaced the Space Shuttle Explorer which was a full-scale, high-fidelity replica of the Space Shuttle which visitors were able to board. Explorer was removed from