Enola Gay dropped the atomic bomb on Hiroshima in World War II. Here’s where the plane is now.

Udvar-Hazy Center in Chantilly, Virginia, features over 200 aircraft and spacecraft on display, but Enola Gay remains one of the most prominent — and controversial — objects in its collection.

The Boeing B-29 Superfortress bomber, which dropped the first atomic bomb on Hiroshima during World War II, is so large that it couldn’t fit into the Smithsonian National Air and Space Museum’s flagship location on the National Mall in Washington, DC.

Instead, Enola Gay is displayed about 30 miles away at the museum’s larger second location, the Udvar-Hazy Center.

Exhibiting Enola Gay sparked intense debate in the 1990s when it was first displayed, as interest groups disputed how the plane’s legacy and the role of the atomic bomb in World War II should be portrayed.

As the world marks the 81st anniversary of the 1945 bombing of Hiroshima on August 6, here’s a closer look at the historic aircraft.