Built in 1958 by Bishop Adama, it sits close to the coastline on the site of the former Fort d'Aumale. Pope John Paul II visited here in 1981. The Notre Dame Church behind the Cathedrale Sainte Marie is actually from the 19th century, but its edifice looks like it's being eaten away by saltwater or Libreville's humidity.
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Another Gabonese government building you'll get harangued over if you try to photograph.
Palais Presidentiel
The executive office of Gabonese government. Can only drive by, photography is prohibited
A memorial to the first president of Gabon post-independence 1960.
A smoky casino with gaming and drinks.
Another museum whose status seems somewhat iffy, but it can be co-located with the Musée des Arts et Traditions du Gabon possibly.
Musée National des Arts, Rites et Traditions
Might be having a bit of a moment with regards to being in operation, but has an intriguing collections of sculptures and other art. Just check with the people at the chamber of commerce there if it's not appearing open.