How about this for a Modern Greek civ?
The Kingdom of Hellas 
Leader: Eleftherios Venizelos
UA: Heroic Resistance
All units receive double

defensive bonuses on improved tiles. Culture output in the

capital increases the

production of military units while at war.
UU: Klepht
Replacing the Rifleman, the Klepht has slightly lower

combat strength, but generates 3

culture and heals completely when pillaging an enemy improvement (except roads) or trade routes. +1

movement in hills.
UB: Mouseio
Unlike the Museum it replaces, the Mouseio does not produce any

culture on its own. However, ancient or classical buildings and wonders in this city will provide 1

culture and

1 tourism. +2

tourism for monuments upon researching flight. +25% production costs.
This Greek civ is focused on a tall, well developed defensive build, focusing on tourism and culture. I feel like there's quite a bit of synergy here between all the uniques. The UA is focused mainly on defence, the Greeks have proven themselves, both in the war of independence and, most famously, the Second World War, as extremely tough and resilient people, who are proud to fight for their culture and heritage, which they see as strong enough to defend at all cost. The UA then emphasises heavily building up your state to be a cultural powerhouse in order to better defend yourself at war, with extensive use of your land providing defensive bonuses, and a big cultural capital allowing you to pump out more units to protect yourself.
The UU and UB compliment this, the UU being rather strong with its additional move in hill tiles and ability to heal completely by pillaging enemy improvements. This ability incentives using the additional mobility to pillage as many tiles as possible to get additional culture, which furthers the build of a culturally powerful nation. The pillaging ability is lost upon upgrading the Klepht, but the additional movement in hills stays, making for some powerful units in later eras. Finally the UB is what really makes this civ powerful. If you've been building up your civ to be tall with lots of urban infrastructure in the capital particularly, you'll get the most out of this museum replacement, further encouraging the player to do that and get even more bonuses out of the UA. It reflects the way Greece uses its ancient heritage to draw in millions of tourists, and its an important part of the Greek economy, thereby referencing Greece's ancient past without explictly using it for a unique, focusing the whole thing on modern Greece.
Overall; tall defensive nation benefits hugely from being strong enough in the ancient and classical eras, translating into bonuses for the lategame.
What do you think guys?