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What is the hole at the top of many domes called?

Great, you answered "Eustyle".

See here what other people have answered:

  • Eustyle
  • Dentils
  • Buttress
  • Oculus
16%
16%
19%
49%
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Interesting fact:

The John Hancock Tower in Boston has a rather dangerous problem. The huge windows occasionally pop out and shatter on the street below. Despite having all 10,334 windows replaced with half-inch tempered glass, the sixty-story building still succumbs to the same unsolved problem. Two guards have been hired to do nothing but spot any cracked panes before they plunge down to the sidewalk.

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