Civilization VII · Exploration Age Spain
Spain is purpose-built for Distant Lands colonization — a genuine Golden Age economy that scales harder the farther from home you settle, capped off by a unique Great Person system found nowhere else in the game.
Unique Ability
"Siglo de Oro" grants Food, Gold, and Production in Coastal Settlements and in Settlements with an Altar (with a larger bonus if both apply at once), doubled again in Distant Lands, plus increased Gold efficiency toward converting a Town into a City — with that Gold bonus itself increasing further for conversions happening in Distant Lands specifically.
Unique Unit
The Conquistador is a unique Great Person Unit, trainable only in Cities with a Wharf, with the specific individual received at random from a pool (Ferdinand Magellan, Francisco Pizarro, Juan Ponce de León, Christopher Columbus, and others) — each can only be received once, and cost rises with every Conquistador already trained. They can only be activated in Distant Lands but gain the ability to embark on Ocean tiles immediately.
Unique Infrastructure
Spain's unique buildings are the Casa Consistorial and the Casa de Contratación, the latter of which increases Movement for your Treasure Fleets once unlocked.