From the late 19th century, American doctors started having an office on their real estate. It was not attached to their house. They usually treated and operated on their patients in their office only.

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In Indus Valley Civilization, houses were built from bricks. The houses were two to three stories high.

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The Knap of Howar is the oldest building in the world. Its location is in the country of Orkney. It dates back to 3600 BCE.

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The Hanging Gardens of Babylon were one of the Seven Wonders of the Ancient World.

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During the 1600s, tulips were so valuable in Holland that their bulbs were worth more than gold. The craze was called tulip mania, or tulipomania, and caused the crash of the Dutch economy.

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The world’s oldest wooden wheel has been around for more than 5,000 years.

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