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International Day of Monuments & Sites

International Day of Monuments and Sites is celebrated annually all over the world on April 18th as a way to honor heritage, diversity, community, and the environment. 

GPA works tirelessly to promote Philadelphia’s staggering 67 National Historic Landmarks by creating an easily accessible map for tourism and heritage interests. GPA has formed a community within the city’s 67 National Historic Landmarks, offering members, city residents, and tourists alike to learn about cultural heritage and all of the hidden gems of our World Heritage City.

A community has taken root within the network of the 67 NHLs, with Global Philadelphia there to organize events, tours, SDG partnerships, and educational opportunities in our Learn Philly Heritage program. IDMS is a day for all of these NHLs to come together and acculturate the Philadelphia community. 

Events & Tours 2024

Global Philadelphia's goal with this day-long series of events was to raise awareness and civic pride in our historic city of Philadelphia. 


Thank you to all who participated to make 2024 another successful year of celebrating Philadelphia's heritage, diversity, and ongoing historic preservation efforts!

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What is IDMS?

The aim of the International Day for Monuments and Sites is to encourage local communities and individuals throughout the world to consider the importance of cultural heritage to their lives, identities and communities, and to promote awareness of its diversity and vulnerability and the efforts required to protect and conserve it.

National Historic Landmark Advisory Board

These civic leaders with expertise in history preservation and the NHL landscape aid GPA in preserving, enhancing, and promoting Philadelphia's 67 NHLs.


  • David Brownlee, Ph.D., FSAH
  • Michael Norris, Executive Director of Carpenters' Hall
  • Cornelia Swinson, Executive Director of Historic Johnson House
  • Janice Sykes Ross, Executive Director of Paul Robeson House & Museum
  • Cassie Thomson, Senior Director of Government and Civic Affairs of Visit Philly