Punctuation

Q. Is there a period after an abbreviation of a country if it is terminating a sentence? “I went to the U.K..”

A. Seriously, have you ever seen two periods in a row like that in print? If we told you to put two periods, would you do it? Would you set your hair on fire if CMOS said you should?

[This answer relies on the 17th edition of CMOS (2017) unless otherwise noted.]