Here's another example from a military perspective.
In my current game I've bordered Hammurabi along a narrow strip of tiles since the beginning of the game, but I've been conquering westward since Asoka's lands were easier and closer, then onward to the leaders bordering him. I've owned this particular tile on the hill in my cultural borders since the start due to having the Confucian holy city there to the south.
So I dropped a fort there and ran a few roads to it, then moved up two longbowmen. The thing is, a fort on a jungle-hill tile is an automatic, instant +100%
non-bombardable defense rating! It's a castle that can't be beaten down. I gave the two longbowmen Drill I and II instead of City Garrison for survivability against the multiple attacks they'd receive from large stacks, and their total bonuses were:
6

base
Tile bonuses:
+50% Jungle
+25% Hills
+25% Fort
+25% Fortified
Unit bonuses:
+25% Hill Bonus
+25% City Bonus
=====
+175%
= 16.5

total
2-3 First Strikes
20% less collateral damage
I dropped 4 catapults in that same tile and never had to worry about attacks from that direction. If an attack ever had actually occurred, I could move up a few units (crossbows/knights, some other things) from the city into the fort and counterattack from the fort tile. Easy location to attack an invading stack from and not worry about withdrawals or victories at low strength, as they're defended by the longbowmen. They'd also heal quickly since it's considered a city tile. Now I've got two mech infantry there and 3 fighters on intercept duty.