The Monuments and Memorial Parks on the National Mall are open 24 hours a day! Most of these Memorials and Museums are outdoors are gorgeous to see early in the morning or later at night. It is also less crowded and cooler (in the summer).
Lincoln Memorial ? ?
National Archives ? ?? (open daily from 10 am – 5:30 pm)
The Supreme Court ? ? (open Monday-Friday 9 am – 4:30 pm)
Washington Monument (closed until Spring 2019 for renovations) ?
? = Restrooms available ? = Indoors ? = One of our favorites