This week marks 59 years since Walt Disney opened the gates to Disneyland on July 17, 1955.

Although many people are familiar with the rides and shows today, visitors probably don't know about some of Disney's best-kept secrets.

From spontaneous performances to “magic moment” certificates, the Disney theme parks have perks for all to enjoy.

The parks have books written about some of their secrets, including "The Hidden Magic of Walt Disney World: Over 600 Secrets of the Magic Kingdom, Epcot, Disney’s Hollywood Studios, and Animal Kingdom" and "Mouse Tales: A Behind-The-Ears Look at Disneyland."

Check out this list to learn more about just a few of Disney's secrets.

Hidden Mickeys
Tash Hepting, Flickr Commons

Throughout Disney World, visitors can find “Hidden Mickeys,” which, according to the Hidden Mickey Guy, are “a partial or complete impression of Mickey Mouse placed by the Imagineers and artists to blend into the designs of Disney attractions, hotels, restaurants, and other areas.”

On the prowl
Brianna, Flickr Commons

After families and employees leave the park at night, Disneyland releases park-official cats to control the mouse population. But the cats weren’t always in the park’s plans.

The cats came on their own shortly after Disneyland opened in 1955, but the park officials decided they were worth keeping around.

According to MentalFloss.com, the cats stay in one of the five permanent feeding stations during the day.

Wranglers maintain the cat population by neutering adult cats, and whenever kittens are found, they are put up for adoption.

Going green
everythingwaltdisneyworld.com

To maintain the magical and “world-apart” illusion, Disney paints garbage bins and administration buildings in green or grey colors called “Go Away Green” or “No Seeum Gray.” One fan collected the green paint chips and had them matched at The Home Depot, according to MentalFloss.com and EverythingWaltDisneyWorld.com.

3 is a magic number
tenesmusphyre, Flickr Commons

Club 33 is an exclusive restaurant in Disneyland’s New Orleans Square.

Club membership costs $10,000 a year and has a $25,000 initial fee. But Club 33 keeps membership exclusive, with a rumor that less than 500 people are on the roster and more than 800 are on the waiting list.

According to BusinessInsider.com, people cannot use cell phones, wear short, tank tops, flip-flops or bare midriff in the dining area.

Hidden tunnels
Anthony Bryan, Flickr Commons

Underground tunnels connect employees to every branch of Disney World, which allow employees to cross the park without traveling through sections where they are out of place.

The model community
Raphael Zanetti, Flickr Commons

Disney World’s EPCOT stands for “Experimental Prototype Community of Tomorrow” and was intended to be a real community for 20,000 residents with schools, monorail transportation, and “no retirees," according to BusinessInsider.com.

Lots o' laundry
littlestschnauzer, Flickr Commons

According to MentalFloss.com, the cast members at Walt Disney World wash more laundry in a single day than if someone were to wash a load every day for 44 years.

In the heart of the mountain
Courtesy Paul Hiffmeyer, Disneyland

When construction on Disneyland’s Matterhorn was completed, the roller coaster only made up the bottom two-thirds of the mountain structure.

Disney employees voted on what to do with the extra space, and installing a basketball court won out. But due to tight space, only one basket was put in, according to MentalFloss.com.

How sweet it is
PeterPanFan, Flickr Commons

Disney theme parks make providing a sentimental and sweet experience a top priority.

While visitors may be tempted to associate the warm vanilla scent that surrounds them as they enter Disneyland with the Candy Palace on Main Street and its culinary confections, they are only partially correct. The scent is produced not by what's baking inside but by the vents on the build's exterior that pump out the aroma, according to Babes in Disneyland.

When the holiday season arrives, the manufactured scent is rumored to change to peppermint, according to www.techeblog.com.

Check mat — hmm...
Joe Penniston, Flickr Commons

The skeletons playing a chess game in the line for Pirates of the Caribbean are locked in a stalemate position where neither player can win, according to BusinessInsider.com.

Breaking the rules
Joe Simmons, Flickr Commons

On multiple occasions, people have tried to spread cremated ashes in the Disney resorts, including inside The Haunted Mansion.

The practice is strictly prohibitted, yet accodring to MentalFloss.com several families ask for permission to do so every year (to which spokepeople always say no).

‘What’s the name of his other leg?’
DISboards.com

In front of the FrontierLand stations, there is a wooden leg named Smith, according to wdwinfo.com.

It is referring to the joke told in "Mary Poppins" in which Bert says, “I knew a man with a wooden leg named Smith, to which Uncle Albert responds, "What’s the name of his other leg?”

This magic moment
Jason and Tina Coleman, Flickr Commons

Each day in Disney World, the first child to enter Tinkerbell’s shop gets to “wake her up.” The child stands on a stool and taps a treasure box three times and says, “Wake up, Tink.” Doing this makes lights come on and music starts to play, and the child is also presented with a certificate for “having a magical moment," according to wdwinfo.com.

The camera adds a few feet
Photo courtesy of The Walt Disney Company

Disney Imagineers used a “forced perspective” technique while building the Cinderella Castle.

The bricks and windows are smaller near the top, and the Main Street buildings are angled to make the castle seem further away, which make the castle look larger than it really is, according to BusinessInsider.com.

Costume party: kids only
joocer., Flickr Commons

The Disney resorts in the United States have a dress code for guests. Children are allowed to dress up, but adults will not be admitted into the parks in costume. And if adults change into a costume while inside the parks, they are asked to leave and change clothes.

(Halloween is the only day day adults can dress up.)

It’s all Morse to me
Narwal, Flickr Commons

The beeps that sound in front of the Frontierland entrance are the Morse code for Walt Disney’s dedication speech at Disneyland, according to BusinessInsider.com.

They're around the world, after all
Shashe01, Flickr Commons

In addition to Disneyland in California and Disney World in Florida, The Walt Disney Company also has resorts in Tokyo, Paris, Hong Kong and one to open in Shanghai in 2015.

Fly the flag
Dougie, Flickr Commons

Of the flags displayed in Disney World’s Main Street, only the American flag is real.

The Imagineers created fake flags so they would not need to be illuminated or lowered at night, according to BusinessInsider.com.

Measuring up
Carlos, Flickr Commons

The Disney park princesses, called “face characters,” have a specific height requirement of 5’4” to 5’7”. However, fairies, Alice and Wendy are usually 4’11” and 5’2”. They are most often between the ages of 18 and 23, according to BusinessInsider.com.

Not a sticky situation
Sean MacEntee, Flickr Commons

To keep chewed gum off of rides, rails, trees and other areas, the Disney parks do not sell gum, according to wdwinfo.com.