"This big concrete slab isn't like anything I usually go to," he said.

The park isn't just open for skateboarders either.

Holly Baranowski roller skates for the Charm City Roller Girls — an all-female roller derby team in Baltimore City — and has visited Sandy Hills a number of times.

"I started roller derby in 2006 and I think the first time I went to the skate park was in 2007 or 2008," the 31-year-old Arbutus resident said.

She said a number of factors led her to try the park.

"One, it was just open and free," Baranowski said. "Two, concrete parks are a lot easier to skate with roller skates on than other parks.

"Also, it's history, because it's one of the first concrete parks on the East Coast," she said. "One of the original skate parks."

Baranowski said the park offers her an opportunity to experiment with her skates in a way that roller derby doesn't.

"When I go there I just try to skate all different mediums to make myself a well-rounded skater," she said. "I just skate around the park and try to do tricks and try to learn new stuff.

"I've been trying to use my skates in a different way," Baranowski said. "We practice on a flat surface [for roller derby] so it's nice to get outside of your comfort zone."

When the park first opened, skaters could come and go as they pleased with little to no regulation, but now, McDougall said, the county has rules in place to ensure skater safety.

The park is open from 3 p.m. to sunset and either Mitchell or John Peugh, the other park employee, is there every day to supervise skaters, who must sign a waiver and get a membership card during their first trip to the park.

The added rules haven't hindered the atmosphere at the park though, Mitchell said.

"It's like a sanctuary where they [skaters] can come and hang out, do whatever they want, and nobody really bothers them," he said.

Both kids and adults use the park and Mitchell said the feeling of unity bridges all generational, racial and economical gaps.

"Actually I was surprised how much time the older skaters take with the younger kids," Mitchell said. "The thing that amazes me, it [skating] crosses all [societal] bridges.

"It's like a big family, very close knit," he said.