Maginot Tower (Jan, 1935)

It seems like they didn’t quite understand that the planes were the important part, not the tower.

Giant Air TOWER to GUARD PARIS
TO GET defense aircraft into action more quickly, architects of Paris have worked out plans for a huge aerodrome tower, more than a mile in height, which will literally hurl planes, into the air at the 5000-ft. level, ready for combat.
High-speed elevators would bring planes from the roof-top-level landing field up to each of the three aerodrome platforms. Swooping downward after leaving the inclined take-off platform, planes would reach flying speed with little loss of altitude.