Photo by Paul Cortez.

D.C.’s fourth Shake Shack is now open.

The Union Station location opened today, with two frozen custard concretes that can only be found there: “Busy Bee (vanilla custard, strawberry puree and Baked & Wired Bee Sting bar with sliced almonds and honey); and Beaux-Arts Banana (vanilla custard, caramel sauce, banana and graham crackers from Pollystyle).” Five percent of the sales from the Beaux-Arts Banana concrete will be donated to Casey Trees.

Located in the West Hall, Shake Shack says the spot “has been carefully designed to harmonize with the historical fabric of the edifice’s structure.” Make sure to notice that while you wait in line for a burger.