National Harbor Sphere will stand 302 feet, first site plan reveals

July 9, 2026 I Washington Business Journal – The first concrete details about the Sphere planned for National Harbor, including its height, have emerged as Sphere Entertainment Co. enters the initial phases of the high-tech venue’s entitlement process.

A concept site plan for the entertainment venue, a preliminary document, illustrates the high-level features of the 6,000-seat suburban Maryland facility, including potential locations of the Sphere’s entrances and parking lots across more than 14 acres immediately north of MGM National Harbor.

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