Although it seems like we're living through landmark historical moments more and more frequently these days, it's still important to learn about historical moments from times past.

A great way to do that is through cool historical photographs, and these 20 pics hopefully can help you gain a new perspective or learn a new fact. Here are 20 interesting and compelling historical photos.

Al Ahmadi oil field, Kuwait, 1991.

Helen Keller teaching a girl sign language, 1907.

A messenger dog leaps over a German trench during World War One, 1915.

A group of hippies recovering bags of marijuana from the frozen Lower Merced Pass Lake in Yosemite National Park, which fell from a crashed smuggler's plane; January 1977.

Members of the Japanese "Marxist Youth League" in a protest, 1970s.

Libyan college student Sadiq Hamed Shwehdi pleads for his life moments before being executed for protesting against Gaddafi.

U.S. Army mules tied in a long picket line at the docks in Palermo, Sicily, before the invasion of Italy. September 20th, 1943.

A wounded German prisoner of war is given a drink of water at a U.S. medical center in Altavilla, Italy. September 20th, 1943.

World Trade Center search and rescue dog takes a break, September 21, 2001.

Preparing and printing the New York Times, 1942.

Two young resistance fighters in Josip Tito’s partisan army during the Second World War. The woman on the left is 15 year old Fana Kočovska, the youngest recipient of Yugoslavia’s Order of the National Hero, 1943.

Walt Disney introduces each of the seven dwarfs, 1937.

Queen Victoria on her deathbed, late January 1901.

The breach in the Aurelian Walls near Porta Pia, opened by Italian artillery fire during the capture of Rome, bring an end to the Papal States. September 20th, 1870.

Madame Marzella and her trained parrots, performing on the Tivoli Circuit in Sydney, Australia, circa 1890.

Vietnam founder and former leader Hồ Chí Minh meets North Korea's founder and former leader, Kim Il-Sung. February, 1957 in Hanoi.

Soviet tankers giving some canned milk to local polar bears, circa 1950.

The landscape after the Allies captured Omaha Beach in Normandy. Some time after June 6, 1944.