Top Ten Defunct Disneyland Attractions

This replaced Flying Saucers, this, like the former, was a trackless ride, meaning powered my magnets controlled by a computer system "telling them where to move".

They replaced it in 2015 with Luigi's Rollickin' Roadsters. - Kyle21

This was a show that simulated a mission to the Moon, it was closed when man was about to take first steps to the Moon.
It got replaced with Mission to Mars, which gives us ideas and hope of when/if/how we'll go to Mars. - Kyle21

This show gives us an idea of us going to Mars someday in the future.
Yet they closed it in November 2, 1992, yet the Disney World version closed for The ExtraTERRORestrial Alien Encounter, which was one of the best and the Scariest attraction in all of Disney, and that too got closed, and replaced with the worst attraction of all time: Stitch's Great Escape.
Nowadays, the ride to simulate a mission to Mars is Mission: SPACE in Epcot at Disney World, and it's so intense that they divided it into 2 versions, green and orange, yet it accurately simulates what it's like to go to space on a mission to Mars. - Kyle21

It replaced the beloved PeopleMover, but became too dangerous and closed down.
They should've kept the PeopleMover, but Disney refuses to. - Kyle21

This was perhaps the 1st trackless ride ever made, which got replaced with Luigi's Flying Tires, and then replaced with Luigi's Rollickin' Roadsters. - Kyle21

I Think They Should Bring This Back - JPK

A classic ride showing us the goods of tomorrow, used to be a part of the New York World's Fair, then that closed down, and this closed down too, in 1973.

At least the Disney World version is still there, and they better not remove it, or they're gonna pay. - Kyle21

Such a big hit, entertaining everyone with their songs, shame they got removed, and got replaced with Innoventions, but that too got removed.

Disney just cares too much about money, because they just want more people giving them their money.

Have you ever read the Greedy Triangle, and the triangle felt desperate and said" if I had just one more side", obviously they're greedy. - Kyle21

Another classic, removed by Disney in the sake of cash $ - Kyle21

Replaced with around the world

It was a wild mouse roller coaster that was about Mulholland Drive in L.A., named after William Mulholland.
It was closed for refurbishment in October 12, 2010 to be rethemed into Goofy's Sky School, which is about Goofy's flight training. - Gregory

Replaced by Incredicoaster

Closed because Bug’s Land is being replaced by Marvel Land, which is just an example of Disney’s stupidity gained from being greedy. - Gregory

It was closed to be rethemed into Pixar Pal-A-Round for Pixar Pier. - Gregory