The Coast Guard is surging resources to help secure July 4 celebrations in Washington, D.C., and around the country, the head of the agency said.

"We've surged over 1,000 additional people, in addition to our regular Coast Guard forces, 79 boats to 13 cities to make sure we are prepared for any contingency, and we can prevent or respond to any threat," Adm. Kevin Lunday, commandant of the Coast Guard told ABC News' Chief Justice Correspondent Pierre Thomas.

For the first time, a large swath of the Potomac around the D.C. monuments will be closed to boaters to make way for a larger than normal fireworks display on the Fourth.

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ABC News' Steve Osunsami takes viewers to President Thomas Jefferson's estate in Monticello, Virginia, where 75 people were naturalized as citizens in a special ceremony. The new citizens hail from countries including Alegria and Ukraine.

ABC News’ Diane Sawyer revealed the Appalachian Mountains as one of the “7 Natural Wonders of America,” a list curated by ABC News and National Geographic celebrating awe-inspiring locations in the United States.

The Appalachians stretch 2,000 miles from Alabama to Canada, including the Blue Ridge Mountains and the Great Smoky Mountains.

Among the other locations that made the “7 Natural Wonders of America" list are the Florida Everglades, the Grand Canyon and Yellowstone National Park.

ABC News’ Mary Bruce is taking viewers to the top of the 110-foot-tall Ferris wheel at the Great American State Fair in Washington, D.C.

The dangerous heat abruptly closed the fair mid-day Friday, with organizers reopening the event later in the day. On Saturday, the Great American State Fair was initially scheduled to open at 10 a.m., but that was pushed to noon due to the heat wave.