One very large war museum, a 1,300-acre park with the art museum inside it, plantation history told from the enslaved side, and a streetcar that is public transport rather than a ride.
The National WWII Museum
945 Magazine Street, open 9am–5pm. Several pavilions of exhibits including the US Freedom Pavilion, plus the remastered 4D Beyond All Boundaries film in the Solomon Victory Theater, which is ticketed separately. Budget most of a day rather than an afternoon.
New Orleans Museum of Art and the Besthoff Sculpture Garden
One Collins C. Diboll Circle in City Park; Tue–Sun 10am–5pm, Wednesdays noon–7pm and free for Louisiana residents. The adjoining Sydney and Walda Besthoff Sculpture Garden — around 100 works in Louisiana landscape — is free to everyone, seven days a week.
Whitney Plantation
5099 Louisiana Highway 18 in Wallace, upriver from the city; open daily except Tuesdays, 9:30am–4:30pm with last entry 3pm. A non-profit museum covering the site's 1752–1975 history from the perspective of the people enslaved there, with a dozen-plus surviving structures. Guided and self-guided options; you need a car.
The St. Charles streetcar
The 12 St. Charles line is a working commuter route through the Garden District, not a heritage ride. $1.25 a trip or $3 for a one-day Jazzy Pass, $8 for three days; RTA also runs the Canal, Rampart–Loyola and Riverfront lines. Pay by the Le Pass app or exact change.
St. Louis Cathedral
615 Pere Antoine Alley on Jackson Square, the building on every postcard of the city and an active parish since 1718. Open daily 9:30am–4pm with last admission 3:45pm; mass is 12:05pm weekdays, 4pm Saturday, 9am and 11am Sunday, and guided access tours can be booked separately.