The US and Europe (with a few notable exceptions) have much in common. They hold democratic elections, fight for human rights, and are conscious of their carbon footprint. But at the same time, they're an entire ocean apart and geography isn't the only thing separating them.
So we dug around the internet and found a couple of online threads (one and two) where people have been sharing what they believe to be the aspects of American culture that are foreign to the Old Continent. From the popularity of university sports to free soda and coffee refills, here are the most popular submissions to the discussion.
#1

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#2

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#3
Expensive healthcare.

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#4

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#5
More firearms than citizens.

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#6

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#7

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#8

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#9

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#10

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#11

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#12

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#13

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#14

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#15

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#16
#17
The Pacific AND the Atlantic.

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#18
Massive student loan.

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#19
The Grand Canyon.
#20

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#21
#22
Diners. Fast cheap American food available at all hours. One of the best meals you will ever eat is American diner food at 2 am.
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#27

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#28
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#30

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#31
Corn tortillas. I'm sure they're somewhere in Europe but not so much in Britain. Just things called corn tortillas that are 90% flour.
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#34

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#35
#36
This one I'll give you. Universities play each other in sports, but nowhere to the scale in America. For football (soccer), most players can be in clubs' academies from the age of 5/6, finish school at 16 and then just go straight into reserve/first team squads, whereas in America they play sports in school, university, then get picked up by clubs.

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#37
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#42

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#43
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#50

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#51
Perfect conditions for road trips. Nice roads, no border control, gas stations, sights, motels. It's perfect.