The 30-round AK 47 is arguably the most recognizable firearm in the world. The Soviet engineer Mikhail Kalashnikov (pictured above in 2002) created the automatic rifle after World War II. It quickly earned a reputation for being cheap and reliable, with various armies, guerilla groups and street gangs all using the weapon to this day.

The 9mm Makarov pistol entered service in 1951 as a staple sidearm for the Soviet army, police and Spetsnaz special forces. Soviet cosmonauts even took the weapon to space as a part of a special survival kit, which was provided to them in case they became stranded upon landing back on Earth.

The Mikoyan MiG-29 first entered production in the early 1980s and was praised as a highly maneuverable and agile dogfighter. The original model has since been upstaged by both NATO fighters and its more expensive brother Sukhoi, but its variants are still deployed in combat. The Russian air force uses MiG-29s to target the so-called "Islamic State" forces in Syria.

The Red Army used Katyushas to devastating effect against German soldiers in World War II. The multiple rocket launchers were attached to army trucks, making them cheap and highly mobile. Its distinctive whine and appearance reminded the German soldiers of a church organ, prompting a nickname "Stalinorgel" or "Stalin's organ."

In 2016, Russia sold its advanced aerial defense system to Iran, but kept quiet on the details. The Cold War-era version of the S-300 had a range of 150 kilometers (93 miles), and could hit targets at altitudes above 27 kilometers, with the more modern Antey 2500 system reportedly expanding the range to 400 kilometers. India and China are seeking to buy the even-more-advanced S-400 missiles.

The Dragunov sniper rifle was first introduced to the Soviet army in 1963 and has since found its way to war theaters across the world. It was reportedly used against US soldiers in Vietnam. In 2015, the SITE Intelligence Group published photos of the "Islamic State" soldiers with Dragunov rifles.

The Red Army owes much of its victory over Germany to the iconic T-34, which first appeared on the battlefield in 1941. The battle-tested T-34 eventually became the most widely produced tank of the war and influenced armored vehicles for decades. The Russian military still honors it by having it lead the Victory Day parade.

Seven bronze sculptures stand on a white stairway at the foot of the Prague Petřin Hill. Inaugurated in 2002, the memorial was originated by sculptor and former political prisoner Olbram Zoulbek. In the inscription of the pedestal it is not only dedicated to those, "imprisoned or executed but also for all those whose life was ruined by totalitarian despotism."

More than 11,000 people were imprisoned between 1951 and 1989 in the remand center of the GDR secret police (Stasi). Previously the grounds, in the Berlin neighborhood of Hohenschönhausen, were used by the Soviet occupying power as a special camp for alleged regime opponents. From there, the prisoners were transported to the Nazi-built concentration camp Sachsenhausen.

Since 2016, this 20-meter-high memorial made up of three wings by the sculptor Mihai Buculei has stood on the pedestal of a torn-down Lenin statue in Bucharest. It is situated in front of one of the most important buildings from the Stalin era, at Free Press Square. The initiative was the idea of the Association of Former Political Prisoners.

In Tirana, the first memorial after the overthrow of the Stalinist regimes was opened in 2017. During the Nazi era, the German occupiers had used the building as a prison. After the Communists came to power in 1945, people were tortured and killed here. Later the secret police used the "House of Leaves," which got its name because of the climbing plants on the exterior of the building.

In Gori, the birthplace of Joseph Stalin, the Soviet dictator still enjoys hero status in the museum named after him – 65 years after his death and 27 years after Georgia regained its independence. Currently there are plans to overhaul the exhibition. The crimes committed under Stalin have only been a central issue at the Georgian National Museum in Tbilisi since 2006.

Around 1.5 million Kazakhs fell victim to the famine of 1932/33, caused by mismanagement and forced collectivism. The sculpture ensemble in Astana is dedicated to the dead. It was inaugurated on 31 May 2012, the national day of remembrance to the victims of political repression.

"Milda" is the nickname given to the 19-meter-high obelisk of a woman’s enthroned figure in Riga. It was erected in the 1930s, before the Soviet occupation in 1940. The statue is the central memorial for Latvians for their will to freedom and self-determination. In past decades it has repeatedly served as the starting point for protests and resistance.

Located between Russia and China, Mongolia suffered under foreign occupation and exploitation for nearly all of the 20th century. For a long time, it was both politically and economically dependent on the Soviet Union. The museum to the memory of the victims of political repression was opened in 1996 in Ulan Bator; a year later, the memorial was added.

The bridge over the Imjin River, erected at the beginning of the 20th century, is the only bridge connecting North and South Korea. It was of great military importance during the 1950-1953 Korean War. On the southern side via a wooden pier you can reach the border. Many visitors leave flags and personal messages at this place.

An estimated 2.2 million Cambodians were killed during the terror regime of the Khmer Rouge. That was approximately half of the population. After the invasion, also by communist troops from Vietnam, human remains and skulls were publicly exhibited, in order to document the crimes. Even today, many mass graves have yet to be discovered.

This statue in Washington DC, inaugurated in 2007, is a replica of the "Goddess of Democracy" erected by Chinese students in 1989 during their fatal protests on Tiananmen Square in Beijing. Local politicians worked alongside eastern European freedom fighters such as Vaclav Havel and Lech Wałesa to erect this memorial in the US capital.

In 1940, Soviets murdered around 4,400 Polish prisoners of war – mainly officers – in a forest near the Russian village of Katyn. In Poland, the massacre is synonymous for a series of mass killings. The initiative for the memorial in New Jersey, which is dedicated to all the victims of Soviet communism, started with Polish migrants in the US.