There is not an exact known number, but there are LOTS of historical monuments. Practically every part of Europe has its own historical monuments.
Cape Krusenstern, Tongass and Misty Fjords are some of the famous monuments in Alaska.
Pestsäule
himalaya
styxs and Athens
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Tikal is a very famous monument in GUatemala
the Berlin wall!!!!!!!!!!!!
the CN tower
i don't know but Copa is a famous ruin!! Sorry
Some famous buildings are the twin towers
No, that's OK.