As many know, on June 30, 1956 a TWA Super Constellation carrying 70 people and a United DC-7 carrying 58 people collided over the eastern Grand Canyon. All 128 souls on board were lost.
The wreckage of each plane fell at different locations about a mile apart, with the TWA ship hitting near the river northeast of Temple Butte, and the United aircraft striking the side of Chuar Butte and falling to a resting place at least 1000 feet above the river.
Investigative teams were able to reach the TWA site by helicopter the following day, but a special mountain-climbing team from Switzerland was brought in to reach the United wreckage.
30 bodies of the 70 on the TWA flight were recovered. Only 3 were identified. There is a common grave and memorial to these victims in Flagstaff. None of the bodies from the United flight were recovered. A memorial to those victims stands in the Grand Canyon Pioneers Cemetery on the South Rim.
On April 23, 2014, the National Park Service designated the crash site a National Historic Landmark. It spans 1.5 square miles, and though it has been closed to backpackers since the 1950s, the new designation will task the NPS with preserving it further.
The application for historic landmark status is heavily redacted, preventing public disclosure of exactly where this landmark is. A highly unusual (if not unprecedented) act for a historic landmark. The public is not permitted to visit this site.
Some interesting reading on the recent landmark designation and the history of the whole event in links below:
http://www.theatlantic.com/technology/a ... rk/361183/
http://grandcanyonhistory.clas.asu.edu/ ... crash.html
Based on the photography in the NAU Kline Library, I've marked the approximate
locations of the two main impact sites on this map (+/- hundreds of yards and feet of elevation!).