It is striking how ancient they all are. What about contemporary wonders?
Well, I don't believe that the poll stipulated that entries be ancient, merely that they be "architectural wonders" .....some fairly newly-built winners were the Christ The Redeemer statue in Rio and the Taj Mahal......... and the Statue of Liberty was announced as a contender for the list (to the dismay of the America-hating Portuguese).
Most of the original "Seven Wonders" have crumbled into the mists of time. From the article:
However, the Hanging Gardens of Babylon, the Statue of Zeus at Olympia, the Temple of Artemis at Ephesus, the Mausoleum of Halicarnassus, the Colossus of Rhodes and the Pharos lighthouse off Alexandria in Egypt have all vanished.
As to contemporary wonders, I'm guessing that many of the most modern Wonders weren't eligible for voting because there are so many....from the giant buildings, huge telecom towers, Seattle's Space Needle to the Channel Tunnel it seems that modern engineering and science has produced so many incredible architectural wonders in the past century that one would need a book to list them all.