This famous waterfall, straddling the border between New York and Ontario, is a massive source of hydroelectric power.
Niagara Falls
Leonardo da Vinci's portrait of a woman with a mysterious smile is the most famous painting housed in the Louvre Museum.
Mona Lisa
Alexander Graham Bell changed global communication forever when he successfully patented this audio transmission device in 1876.
Telephone
Reaching lengths of up to 100 feet, this majestic mammal is the largest animal ever known to have lived on Earth.
Blue Whale
This violent, rotating column of air extends from a thunderstorm to the ground and is often called a twister.
Tornado
Straddling the border of Nepal and China, this peak is the highest mountain above sea level on Earth.
Mount Everest
This Vincent van Gogh masterpiece captures a swirling, glowing night sky over a French village.
Starry Night
This 15th-century machine, invented by Johannes Gutenberg, allowed for the rapid, widespread printing of books across Europe.
Printing Press
These apex predators have multiple rows of sharp teeth, cartilaginous skeletons, and a dorsal fin that cuts through the water.
Sharks
This severe winter storm is defined by sustained winds of over 35 mph and heavy blowing snow that reduces visibility to near zero.
Blizzard
This active stratovolcano, famous for its symmetrical snow-capped cone, is the highest peak in Japan.
Mount Fuji
This American artist painted a somber farmer holding a pitchfork alongside his daughter in the 1930 regionalist work American Gothic.
Grant Wood
Thomas Edison is credited with commercializing this bright household item after creating a long-lasting carbon filament version in 1879.
the lightbulb
This highly intelligent, eight-armed marine mollusk is famous for its camouflaging abilities and ink-squirting defense mechanism.
Octopus
This rapid, massive slide of snow, ice, and debris down a mountainside can reach speeds of over 80 miles per hour.
Avalanche
This dramatic fjord region in southwestern New Zealand was famously described by Rudyard Kipling as the "eighth wonder of the world."
The Millford Sound
Norwegian expressionist artist, Edvard Munch painted a figure holding its face and crying out in his famous 1893 work
The Scream
Orville and Wilbur Wright made history in 1903 by achieving the first sustained, controlled flight of this type of vehicle.
the airplane
Visible from space, this massive biological structure off the northeast coast of Australia was built by billions of tiny coral polyps.
The Great Barrier Reef
This long period of abnormally low rainfall leads to a severe shortage of water, drying up soil and crops.
Drought
This massive sandstone rock formation in the Northern Territory of Australia is sacred to the local Anangu people and is also known as Ayers Rock.
The Uluru
This 1937 anti-war masterpiece by Pablo Picasso depicts the tragedies of war and the suffering it inflicts upon civilians.
Guernica
Scottish scientist Alexander Fleming revolutionized medicine when he accidentally discovered this first true antibiotic mold in 1928.
penicillin
This unique species of small marine fish is famous because the male of the species carries and gives birth to the eggs.
Seahorse
This type of sudden, destructive flooding happens within a few hours of intense rainfall, often trapping people in low-lying areas.
Flash Flood