The original Declaration of Independence is housed in the National Archives Building, which is located at 700 Pennsylvania Avenue, NW, in Washington, DC. The document is on display for public viewing in the Rotunda of the National Archives building.
The general public can indeed see the original Declaration of Independence, and there is no cost to visit the National Archives. However, I would advise you to arrive early, as there can be long lines, especially during peak tourist season.
The National Archives building is open daily, year-round, except for Thanksgiving Day and Christmas Day. The regular hours of operation are 10:00 am to 5:30 pm. You can find more information on their official website: https://www.archives.gov/visit
I hope you have a great time visiting the National Archives and seeing this historic document!