Two teenage boys skate down one of San Francisco's steep hills sometime in the 1950s

A wounded British soldier is carried through Belfast in 1919

A shepherd and his sheep walk through the streets of London in 1910

Prohibitionists dispose of illegal alcohol during the 1920s.

Some 4,500 students take part in a calligraphy contest in 1970

A 14-year-old boy lifts a man on a motorcycle above him in 1932

Native American Nez Perce cowboys take a rest next to their horse in 1885

Parisians enjoy go-karts in 1900.

A baby in an incubator in the 1950s.

A child poses with his family's pet pig in 1930

Young farmers in Germany – 1914

Teenagers at a party with coke and cookies in Tulsa, Oklahoma – 1947

Skateboarding teens in New York City – 1965

Teenagers posing with their first car - 1950's

he Beatles, before they grew their famous hair

French girls in short pants – 1967

The Golden Gate Bridge was still under construction and looked like this, 1937

Delivery vans line up outside a Greenbelt, Maryland, grocery store waiting to be loaded up, 1942

A man riding a Railway Motor Tricycle in 1905

An ostrich-drawn cart from the Cawston Ostrich Farm, California, 1919

A one-wheel motorcycle from 1933. It was built by M. Goventosa of Udine, Italy, and was capable of speeds of 150 km/h, or about 93 mph