Quick question

[mickey04]

Can you build rides completely underground. I don't mean things like custom rollercoasters, but rides like a meery-go-round or bumpercars. I didn't think that this could be done until I saw it. How do you make them (including entrances/exits) undeground?

 

[Legacy]

You can't.

You can put land all around it to look like a hill and then put pathways on top of that and surround it with trees so you can't see the tarmac squares, but that is the ONLY way that I have ever seen.

Unless someone cheated and used on WICKED trainer.

 

[NowInc]

You can ...2 ways...both are hard..

hex edit...

or

Use a trainer...

 

[radioandy]

You can make a pretty decent looking "indoor" ride with the technique Kicker describes above.
In my mock Epcot park, I made an "American Adventure" theater inside a building by lowering land, placing the 3D theater, then building land (walls) around it. A cobblestone path used as a bridge makes a good roof...but the roof needs lots of clearance above the ride...this is why I lowered the land first. Now the theater building is about the same height as the colonial house facade in front of it.
Then you lead paths down to the entrance/exit.
Hope that's what you were looking for.