The "Summit House" is an unusual structure (called Hollybush) located in Glassboro, Gloucester County, New Jersey.
This house was the location of the famous summit meeting between President Lyndon B. Johnson and Soviet Premier Alexei Kosygin in 1967.
It is owned by Rowan University, (it was the former home of the college president) and was recently opened for one day for public view. The college plans to hold additional open houses, but there are no regular viewing hours.
The Rowan University link about does, however, have a contact should you have more questions about this building and its history.