National Park Service regulations currently require masks in all federal buildings regardless of vaccination status.

Thank you to all photographers who have graciously agreed to allow us to use their photos on our website:

John Barclay
Eli Rivera
Heather Chadwick
Maria Schramm
James Maloney
Jennifer Loven
Alex Westner
Clay Spencer
Richard Frear
M. Woodbridge Williams
Don F. Mitchison
Office of Sustainability, Princeton University

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