RollerCoaster Tycoon

In the .zip you'll find two folders. One has fences, the other has gateway objects.
Originally created by Kornsoadhts

Where can I find the pack? [in-game]:
The set has the theme "Adventure", so you can find it under the pirate hood.
Here is the list from all the objects and his place in-game:
Main Pack:
Theme: Adventure
Place: Scenery
Goodies Pack:
Theme: Adventure
Place: Scenery Items
Rope Pack:
Theme: Adventure
Place: Scenery Items
Billboard Pack
Place: Billboard Section
Originally created by Ckef Worx

Originally created by Ckex Worx

An expansion pack to the Tiki Jungle set.
Originally created by MGP

Originally created by T4L

Originally created by T4L

Originally created by T4L

A set of jungle-themed items.
Originally created by MGP.

A small but versatile set nonetheless. Includes billboarded TV screens to add anything you want to them. Perfect for industrial themed rides.
Originally created by MGP

Found under the walls menu for obvious reasons, this will transform any border of your park to give a fantastic facade of a city skyline. Includes seven pieces to mix and match to build the skyline you’ve always wanted.
Originally created by MGP

Here’s another quick set with a few church windows and wall pieces to spruce up any gothic themes you many have going.
Originally created by MGP.

Let the harvest and corn maze creation begin. Plant rows upon rows of these delicious husks. Three different types to choose from. Unleash your inner farmer.
Originally created by MGP.

Caddyshack anyone? Unleash your inner golfer and swing away with this full featured set. Hop on the golf cart, and take a drive around the fairway.
Originally created by MGP.

With this nifty set, you can create “ruins” and “temples” with a nice aged feel.
Originally created by MGP.

Create a ruined environment complete with walls, floor, torches, columns and other goodies I'm sure you'll find useful.
Originally created by Weber.

Plenty of goodies to make that rustic warehouse you’ve always wanted. Unleash your inner steel worker with assorted walls, roofs, catwalks, steel beams, pipes, tanks, fans, signs, and a whole bunch more.
Originally created by xIWillDestroYouAllx

This is an expansion of Barns. Contains a lot more peices
Originally created by MGP

A post-apocalyptic set of scenery. 
Originally created by MGP
 

A set of nice animated bells.
Updated: 02/15/10
Originally created by MGP

Black walls used mainly for dark rides.
Originally created by MGP

Nice dark colored bricks for any purpose.
Originally created by MGP

With this set you can add carnival realism to your park. Contains various concessions that resemble the real thing!
Originally created by MGP

A very flexible Billboard set complete with Curved, large and street sign billboards.
Originally created by MGP

With this set you can create that perfect hedge maze.
Originally created by MGP

This is a set designed to be used as portable ride supports found on carnival rides.
Originally created by MGP