Historical clue formulations

• Towering figure of architecture? — 2021-07-14
• Gustave with a tower named after him — 2016-09-08
• Towering Frenchman? — 2015-08-06
• ___ Tower — 2013-01-08
• French engineer Gustave — 2008-11-09
• Towering figure in French engineering — 2007-12-09
• Tower designer — 2005-02-02
• Tower designer Alexandre — 1995-11-24