International Monument No. 163, located in Organ Pipe Cactus National Monument in Arizona.
Century Old Obelisks Mark U.S. Mexico Boundary Line (International Monument No. 163)
Last Modified: Mar 06, 2024
Official websites use .gov
A .gov website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.
