Up to 30,000 runners will participate in the 44th annual Marine Corps Marathon this Sunday in D.C., braving a winding 26.2-mile course through the city’s major monuments and landmarks.

This year, for the first time, the marathon has added an ultramarathon to its course as well—that’s 31 miles. About 1,700 slots were open for ultramarathoners, and they sold out back in March, just one hour after registration opened. It’s one of the only urban ultramarathons in existence.

“What you are getting at Marine Corps is the organization skills of the Marines,” including the placement of water points and aid stops, said marathon director Rick Nealis Wednesday on The Kojo Nnamdi Show. Many times, marathoners bring extra food and supplies of their own to get through the race. “You can leave that stuff behind, we’re going to take care of you. We’re going to have a dedicated food station just for the ultras,” Nealis said.

The Marine Corps Marathon is the largest marathon in the country that doesn’t offer money to its top finishers. It’s known as “the best marathon for beginners”—there’s no necessary qualifying time, though runners are required to keep at least a 14-minute-per-mile pace throughout the marathon. Runners who don’t make that time are diverted off the official course, and though they can keep running, they aren’t considered official finishers, per the website.

The course begins in Arlington, Virginia near Arlington National Cemetery and passes through Rosslyn onto the George Washington Parkway, crossing the Key Bridge into Georgetown, eventually past the Kennedy Center, the Lincoln Memorial, the Thomas Jefferson Memorial and the Tidal Basin, the Martin Luther King Junior Memorial, the Washington Monument, the Capitol Building, and the National Mall. Runners eventually back across the 14th Street Bridge and back into Arlington to finish at the Marine Corps War Memorial.

Here’s what the course looks like:

Each year, runners at mile 12 reach what’s known as the blue mile, where volunteers hold up 225 posters with faces of fallen soldiers. This year, there will be psych teams encouraging runners who become emotionally overwhelmed during the blue mile, Nealis said on the Kojo Show.

“I now know that we put emotional stress on runners,” he said. When the team recognizes that someone has become emotionally overtaken, they’re there to provide support and encouragement, helping the runners to keep going and finish the marathon. “We’re giving them a little bit more care. That’s the hallmark of the Marine Corps Marathon. We’re the people’s marathon,” Nealis said.

Metro will open early on two hours early on Sunday, at 6 a.m., and run extra Blue and Yellow line trains to accommodate marathoners. Several streets along the route will also be closed as marathoners pass through them. Here’s a complete list of closures:

Street Closures

• 4:00 a.m. – 1:30 p.m. – Madison Drive, NW from 7th Street to 14th Street, NW
• 5:00 a.m. – 1:30 p.m. – Jefferson Drive, SW from 3rd Street, SW to 15th Street, SW
• 5:00 a.m. – 1:30 p.m. – 7th Street, NW from Madison Drive, NW to Jefferson Drive, SW
• 6:00 a.m. – 11:30 a.m. – Rock Creek and Potomac Parkway, NW (northbound) to Beach Drive
• 6:00 a.m. – 11:30 a.m. – Rock Creek and Potomac Parkway, NW (southbound) from Shoreham
• 6:00 a.m. – 11:30 a.m. – Shoreham Drive, NW (southbound) from Calvert Street to Rock Creek Parkway and Potomac River Freeway, NW
• 6:00 a.m. – 11:30 a.m. – Beach Drive, NW from Rock Creek and Potomac Parkway, NW to Calvert Street
• 6:30 a.m. – 12:00 p.m. – Spout Run Parkway, from Lee Highway to George Washington Memorial
• 6:30 a.m. – 12:00 p.m. – GWMP from Spout Run to Key Bridge off ramp
• 6:30 a.m. – 12:00 p.m. – Francis Scott Key Bridge (all lanes)
• 6:30 a.m. – 12:00 p.m. – Canal Road from Key Bridge to Arizona Avenue, NW
• 6:30 a.m. – 1:30 p.m. – 14th Street, SW from Jefferson Drive to northbound HOV lanes
• 6:30 a.m. – 2:00 p.m. – HOV lanes from 14th Street, SW to HOV ramp at South Eads Street
• 6:30 a.m. – 12:00 p.m. – M Street, NW from Canal Road, NW to Wisconsin Avenue, NW
• 6:30 a.m. – 11:30 a.m. – Wisconsin Avenue from M Street, NW to K Street, NW
• 6:30 a.m. – 11:30 a.m. – K Street, NW from Wisconsin Avenue, NW to Rock Creek and Potomac Parkway, NW
• 6:30 a.m. – 11:30 a.m. – 27th Street, NW from K Street, NW to I Street, NW
• 6:30 a.m. – 11:30 a.m. – I Street, NW from 27th Street, NW to Virginia Avenue, NW
• 6:30 a.m. – 12:30 p.m. – Rock Creek Parkway and Potomac Parkway, NW from Beach and Shoreham Drives to Independence Avenue, SW
• 6:30 a.m. – 12:30 p.m. – Lincoln Circle from 23rd Street, NW to 23rd Street, SW
• 6:30 a.m. – 12:00 p.m. – Ohio Drive, SW at West Potomac Park from Independence Avenue, SW around East Potomac Park to Maine Avenue, SW
• 6:30 a.m. – 12:30 p.m. – Maine Avenue, SW from East Basin Drive to Independence Avenue, SW
• 6:30 a.m. – 12:30 p.m. – East Basin Drive from Maine Avenue, SW to Ohio Drive road closure
• 6:30 a.m. – 12:30 p.m. – Independence Avenue, SW from Maine Avenue, SW to Ohio Drive
• 6:30 a.m. – 1:00 p.m. – 15th Street NW/SW from Constitution Avenue, NW to Maine Avenue SW
• 6:30 a.m. – 1:00 p.m. – 3rd Street; Pennsylvania Avenue, NW to Maryland Avenue, SW
• 6:30 a.m. – 1:00 p.m. – 4th Street; Constitution Avenue, NW to Independence, SW
• 6:30 a.m. – 1:00 p.m. – Pennsylvania Avenue, NW from 3rd Street, NW to Peace Circle
• 6:30 a.m. – 1:00 p.m. – 1st Street; Pennsylvania, NW to Maryland Avenue, SW
• 6:30 a.m. – 1:00 p.m. – Pennsylvania Avenue, NW from 3rd Street, NW to 1st Street, NW
• 6:30 a.m. – 1:00 p.m. – Maryland Avenue, SW from 1st Street, SW to 3rd Street, SW