Unsurprisingly given that Ala Mhigo more or less got shorted during Stormblood, Gyr Abania has a number of these particularly in The Peaks and The Lochs.

In the Peaks there's a lot of stuff with lore behind the 6th umbral calamity/fallout from the War of the Magi. The Ziggurat, the massive upside down pyramid full of Qiqirn. It has some lore about it being built by the survivors of Mhach and Amdapoor following the calamity to stabilize the aether. There's Nyunkrepf's Hope, the boat that's sitting on top of a mountain, that carried survivors out of the path of the rising waters from the flood.

There's also a lot of Qiqirn around which were stated to have been planned to have beast tribe quests planned for them which got cut during the patch cycles and replaced by the Namazu. Presumably those would have been the vehicle for using those landmarks expanding upon that lore, but now they'll probably go unused.