Legend has it that the Dent Schoolhouse in Cincinnati was the site of a mass murder 60 years ago. "The school opened up in 1894 and was shut down in the 1950s after it was discovered that a janitor named Charlie McFree killed a bunch of kids and put the bodies in the basement," Dent Schoolhouse owner Bud Stross told The Huffington Post.

The Dent Schoolhouse, a haunted attraction, in Cincinnati, during last year's Halloween season, Oct. 29, 2015. | (AP Photo/John Minchillo)

Stross and his high school friend Josh Wells bought the dilapidated structure about a decade ago, got it up to code, and turned it into a wildly popular haunted house that now employs about 100 people during the two-month Halloween season.

"It takes a whole year to get it ready," Wells told The Associated Press.

As for the school's haunted past? Stross can't confirm that the stories are true, but it certainly makes for good PR if you're in the business of scaring people. During the fall fright season, the Dent Schoolhouse attracts tens of thousands of visitors who line up around the block for the chance to come face-to-horrifying-face with Charlie McFree and his chilling squad of undead.

For a taste of the Dent Schoolhouse's haunts, take a tour of last year's frightful fun:

Oct. 29, 2015. | (AP Photo/John Minchillo)

Oct. 29, 2015. | (AP Photo/John Minchillo)

Oct. 29, 2015. | (AP Photo/John Minchillo)

Oct. 29, 2015. | (AP Photo/John Minchillo)

Oct. 29, 2015 | (AP Photo/John Minchillo)

Oct. 29, 2015 | (AP Photo/John Minchillo)

Oct. 29, 2015 | (AP Photo/John Minchillo)

Oct. 29, 2015 | (AP Photo/John Minchillo)

Oct. 29, 2015 | (AP Photo/John Minchillo)

Oct. 29. 2015 | (AP Photo/John Minchillo)

Oct. 29, 2015 | (AP Photo/John Minchillo)