I've been mulling over some ideas for new Natural Wonders. You'll notice a theme that's missing two in the set. If you have any ideas for filling in the gaps, I'd be happy to hear it.
STRAIT OF MAGELLAN
+3
, +1
, +25%
Great Admiral
MOON HILL
+3
, +1
, +25%
Great Artist
BLACK HILLS
+2
, +2
, +25%
Great General
LAKE PONTCHARTRAIN
+3
, +1
, +25%
Great Musician
GALAPAGOS ISLANDS
+4
, +25%
Great Scientist
BLACK FOREST
+3
, +1
, +25%
Great Writer
WITWATERSRAND
Provides 2 Gems, 2 Gold, and 2 Uranium Resouces
ROCK OF GIBRALTAR*
+4
, +1 Trade Route
NGORONGORO CRATER
+2
, +2
, Zoos provide +1 
*Double checking the Natural Wonder list today, I realized that the Rock of Gibraltar is already a Natural Wonder. Somehow, I've never discovered it in all my Civ5 games.
STRAIT OF MAGELLAN
+3



MOON HILL
+3



BLACK HILLS
+2



LAKE PONTCHARTRAIN
+3



GALAPAGOS ISLANDS
+4


BLACK FOREST
+3



WITWATERSRAND
Provides 2 Gems, 2 Gold, and 2 Uranium Resouces
ROCK OF GIBRALTAR*
+4

NGORONGORO CRATER
+2



*Double checking the Natural Wonder list today, I realized that the Rock of Gibraltar is already a Natural Wonder. Somehow, I've never discovered it in all my Civ5 games.