The Roman Garden is both a building and recipe.
The Roman Garden takes up 2 X 2 spaces making the happiness and culture worth 562/56 per square. It can be sold for 6000 silver. It is acquired through the Workshop. This is the second set of recipes you learn.
Below are the rewards and price in gold to be completed instantly for each sub-recipe.
1x Gravel - Quarry (30 minutes to produce)
1x Statue - Quarry (18 hours to produce)
1x Pillar - Quarry (48 hours to produce)
2x Grapes - Vineyard (5 minutes to produce)
1x Raisin - Vineyard (4 hours to produce)
2x Juice - Vineyard (30 minutes to produce)
1x Laurel - Vineyard (48 hours to produce)
1x Fountain - Quarry (24 hours to produce)
3x Park Benches - Lumber Mill (4 hours to produce)
1x Gazebo - Lumber Mill (48 hours to produce)