Italy

Crashed on takeoff for unknown reason. The pilot, sole on board, was injured.

In unclear circumstances, the airplane struck the west slope of Monti della Laga located near Amatrice. All four crew members were killed.
Crew:
Cpt Jess Edward Montgomery, pilot,
Cpt Albert Joseph Henrion, copilot,
Sgt Elmer Arthur Kludt, radio operator,
Cdt Frantz Egidy.

While cruising in poor weather conditions, the airplane struck Mt Argentera (3,297 meters high) located in the Italian Alps. The wreckage was found a week later, on March 22 on the west slope of the mountain. The airplane was destroyed and all six crew members have been killed. It is believed the aircraft was off course at the time of the accident, maybe following a navigation error.

En route from Athens to Naples, one of the engines suffered a runaway prop. 15 passengers and the radio operator bailed out over Botricello, intending to land at a nearby emergency field. They couldn't make the field and the pilots and the engineer put the plane down intact on the beach. The slanted beach caused them to veer into the surf and the aircraft ended up in about 10 feet of water. The crew was able to exit the astrodome hatch and swim to shore. Overnight the action of the tide destroyed the aircraft. The rumors that the aircraft was repaired, flown off the beach and put back in service are untrue.
Source: http://www.joebaugher.com/usaf_serials/1953.html

Shortly after takeoff from Brindisi Airport, while climbing, the airplane crashed into the sea few dozen yards off shore. SAR were conducted but eventually suspended three days later as no trace of the aircraft nor the crew was found. The wreckage was finally located in a depth of 18 meters about 1,8 km off shore.

The Viscount was being used for a semi-annual flight crew check involving a simulated two engines out emergency landing. The aircraft was approaching Ciampino runway 16R with engines number 3 and 4 out when it suddenly went into a right bank, some 400 meters short of the runway threshold. The Viscount struck the ground with the right wingtip, crashed and burned. Both pilots were killed.

About fifteen minutes after it departed Milan-Malpensa Airport, while cruising at an altitude of 10,000 feet, the crew encountered poor weather conditions with thunderstorm activity. It is believed the airplane was hit by lightning when the right wing broke off shortly later. Out of control, the airplane entered a dive and eventually crashed in a field located 32 km northwest of Milan. The aircraft was totally destroyed and all 68 occupants have been killed.
More info on https://www.olgiateolona26giugno1959.org/cra_e.html

After takeoff from Naples-Capodichino Airport, while climbing, the aircraft stalled and crashed in a farmland. Three passengers and one worker on the ground were killed while 17 other occupants were injured. US Navy personnel and family members were on their way to Malta.

The twin engine aircraft left Guidonia AFB in the morning on a short flight to Latina Airbase located about 50 km south of Guidonia. While approaching Velletri, the crew encountered foggy conditions when the airplane struck the slope of Mt Artemisio and crashed. Both pilots and a passenger were killed while two other passengers were injured.
Crew:
Lt Elio Pertone, pilot, †
1st Lt Pellegrino Di Troia, copilot. †
Passengers:
S/Sgt Matteo Laganà, †
S/Sgt Antonio Calzolaro,
Angelo Della Nova .

The crew was completing a cargo flight from England to Australia and made an intermediate stop at Brindisi Airport. The aircraft started the takeoff from runway 32 and swerved left off the runway after a 550 m ground run. Rough terrain caused the left landing gear leg to be torn off. The plane came to rest at 820 m past the runway threshold and burst into flames. Two crew members were killed while four others were injured. The aircraft was destroyed by fire.