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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. 

2025 Featured Sites

 

  • Arch Street Meeting House

  • Carpenters’ Hall

  • Church of the Advocate

  • Cliveden

  • College of Physicians - Mutter Museum

  • Eastern State Penitentiary

  • Fairmount Park Conservancy

  • Fairmount Water Works

  • Girard College

  • Historic Rittenhouse Town

  • Independence Hall

  • Johnson House Historic Site

  • Laurel Hill Cemetery

  • Mother Bethel AME

  • Please Touch Museum

  • Stenton

  • Wagner Free Institute of Science

  • Woodford Mansion

  • Wyck

A big thank you to all sites that participated!

 

Full list of phl national historic landmarks

Events & Tours 2025

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

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Event
Architecture Adventures Open House at Founder's Hall
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Event
Campus Architecture & History Tour for Int'l Day of Monuments and Sites
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Event
Liberty or Death: Revolutionary War Patriots
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Event
Stamp Rally and Scavenger Hunt Launch at Johnson House Historic Site
Stenton Museum Public Tours
Event
Free Tours at Stenton Museum
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Event
Woodford Mansion: Global Threads of the Naomi Wood Collection
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Event
Mother Bethel AME Church and Museum Tour
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Event
Visit Independence Hall – A UNESCO World Heritage Site
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Event
Junior Ranger Day at Independence National Historical Park
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Event
Banners of Liberty: An Exhibition of Revolutionary War Flags
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Event
Visit Elfreth’s Alley!
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Event
Spring Fest at Historic Rittenhouse Town
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Event
Parkside and Centennial District Walking Tour
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Event
Wagner’s Free Institute of Science Landmark Site and Exhibit Hall Tour
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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.

Learn more
Full list of NHLs in Philadelphia

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
  • Paul Steinke, Executive Director, Preservation Alliance of Greater Philadelphia
  • Cassie Thomson, Senior Director of Government and Civic Affairs of Visit Philly