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American bison (Bison bison) also known as buffalo or plains buffalo on the prairie, western U.S.

What’s the Difference Between Bison and Buffalo?

Snowshoe hare (Lepus americanus) with its Summer coat on the left side and its winter coat on the right.

7 Animals That Turn White in Winter

Portrait of a mountain gorilla at a short distance. gorilla close up portrait.The mountain gorilla (Gorilla beringei beringei)

Falling Stars: 10 of the Most Famous Endangered Species

United States electoral college map showing number of electoral votes by state.

How Does the Electoral College Work?

New York NY/ USA- November 23, 2018 Hordes of shoppers throng the Macy's Herald Square flagship store in New York looking for bargains on the day after Thanksgiving, Black Friday.

Why Is It Called Black Friday?

The Colosseum, Rome, Italy. Giant amphitheatre built in Rome under the Flavian emperors. (ancient architecture; architectural ruins)

New Seven Wonders of the World

Black widow spider

9 of the World’s Deadliest Spiders

gate

architecture

Learn about this topic in these articles:

Roman architecture

In Western architecture: Types of public buildings
A monumental city gate, while sometimes serving a commemorative purpose, differs from an arch in being part of the defenses of the city. Of these gates the most famous are the Porta Nigra at Trier in Germany and the gate from Miletus in Turkey.
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