In Haunted House Builder, as you finish missions you'll unlock increasingly spooky areas to setup new haunted houses.
Each area has a sandbox mode where you can do whatever with unlimited funds and also different missions, when completed, will unlock more areas and different decorations.
There's a bunch with different themes and layouts, here's a few:
Parking Lot
A vacant lot with a cardboard haunted house. This is the starter area.

Spooky Forest
An abandoned haunted house. Fun Fact: This was actually the first map made and the one everything was tested on.

Field
Set in a wide open grass field with nothing in the distance, this area has a plywood setup.

Graveyard
A classic graveyard with mausoleums, gravestones, cast iron fences and more. This might contain a secret if you know where to look (hint hint, wink wink)

These are only some of the areas. To travel from area to area you use the overhead map:
