Belém Tower Manueline fortress, Lisbon, Portugal

Given its modern reputation as a laid-back land where wines are savored and waves are surfed, it's hard to fathom Portugal's past as a world-spanning militaristic empire. But the proof is set in stone (local lioz limestone, to be exact) all over this Iberian nation. Take Belém Tower for example, an important instance (along with nearby Jerónimos Monastery) of the prevailing Manueline architecture style of early 16th-century Portugal. Manueline designs tended to reflect the nation's then-newfound status as a global naval power: The style cribbed motifs from cultures across the globe and blended them into an ornate, essentially Gothic style. A crucial fortification through centuries of war with rivals like the Spanish, French, and Dutch, Belém Tower still stands vigil at the gateway to Lisbon's harbor.