Vintage photos show how presidential limousines have changed, from open convertibles to Biden's $1.5 million armored Cadillac known as 'The Beast'

• US presidents used to ride in unarmored convertibles with open roofs.

• After John F. Kennedy's assassination, presidential cars were customized with safety features.

• Today's presidential limousine is a 20,000-pound, $1.5 million Cadillac known as "The Beast."

US presidents used to ride around in open convertibles. Today, President Joe Biden is driven in a 20,000-pound, $1.5 million armored Cadillac known as "The Beast."

Take a look at how presidential limousines have changed through the years.

Presidential cars replaced horses and carriages in the early 20th century.

President William McKinley, who served from 1897 to 1901, was the first US president to ride in a car, according to the National Archives.

The administration of President Theodore Roosevelt, who succeeded McKinley after his 1901 assassination, was the first to include a government-owned car.

In 1941, President Franklin D. Roosevelt became the first president to ride in an armored vehicle — a limousine that previously belonged to gangster Al Capone.

Roosevelt previously drove around in a 1936 Packard Touring Limousine. Then, in 1941, he upgraded to an automobile with bulletproof glass that the Treasury Department had seized from Capone in 1932, according to the US Secret Service.

President Dwight Eisenhower's presidential limousine was a 1955 Chrysler Crown Imperial.

The car featured a 250-horsepower V8 engine and a sunroof, according to the US Secret Service.

President John F. Kennedy's assassination in the back of a 1961 Lincoln Continental changed presidential cars forever.

Kennedy's limousine included a hydraulic seat that could be raised 10.5 inches for a better view of the president, but no protective features.

After Kennedy's assassination, presidential cars were customized to prioritize the safety of the commander-in-chief with thick layers of armor.

Subsequent presidents rode in a fleet of heavily fortified Lincoln Continental cars.

President Richard Nixon's 1967 Lincoln Continental was constructed with 4,000 pounds of armor, bulletproof glass, and a roof thicker than the cockpit of an F-16 fighter jet, the Los Angeles Times reported.

A 1969 model featured a bumper that could be converted into a platform for Secret Service agents.