Le Cachot was taken out for the 1999 season. It was originally going to be rethemed into the Haunted Castle, but further inspection of the building ruled that it would be unsafe. During the process of removal, a fire started, but there were no damages to other rides.
Le Cachot had been around since the 50's, I believe, originally a jungle theme, and one year it was even nameless. The next year it was called Zoomerang, and that lasted until the 60's where it was rethemed to Le Cachot ("The Dungeon"). It was really my favorite dark ride until it was removed :(.
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Kennywood Insider's Guide
http://kennywood.coaster-mania.com