Visitors in Washington are accustomed to lines -- at the marble monuments, outside the dozens of museums and finally at the airport on their way home.

But on the eve of the most anticipated Supreme Court decision in years, another line is forming in the nation's capital: outside the building where nine justices will make history Thursday.

Along the sidewalk on First Street NE, three people had lined up as of Wednesday afternoon, prepared to spend the night outside in anticipation of Thursday's 10 a.m. ET ruling.

Laura Brennaman, a registered nurse who traveled to Washington from Fort Myers, Florida, on Wednesday, said her proximity to America's health care system led her to believe President Barack Obama's law was necessary.

"People in this country need access to health care," said Brennaman, seated in a red fabric chair just feet from the west front of the court. "I'm a nurse. I've watched people come into emergency rooms for the last 30 years who haven't had access to primary care and preventative care, and they come in with very significant, very advanced chronic health problems that are expensive to treat and offer a lot of disability."

Thursday's ruling, Brennaman said, would be historic, no matter how the court rules.

"I'm passionate about health care, and history is going to be made tomorrow," she said. "I had the opportunity, because they announced when they were going to issue the opinion in advance, to grab and airplane ticket and fly up and sit here all night, and I just thought I was gonna grab the opportunity and do it."

To Brennaman's right sat Dutch Anderson, a high school history teacher from Pleasanton, California, who said he would add Thursday's ruling to a list of historical benchmarks.

"I'm just going to take it in," Anderson said. "To see in person the Supreme Court justices, and to be a part of history, and to know that I'm in one of the view seats available, and I'm there, it's like, I know where I was when Kennedy was shot, I know where I was on 9/11, and I can saw I know where I was when the Supreme Court ruled on the health care law."

No matter which way the court rules, Anderson said, the American system of government would be at its most visible Thursday.

"What I hope happens is the law's interpreted correctly by the justices, and our system of government will not fail us, and they'll render a decision that will be good for the people," Anderson said.