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April 18 is observed annually as the International Day for Monuments and Sites.

In 1982, the International Council on Monuments and Sites (ICOMOS) established 18 April as the International Day for Monuments and Sites (IDMS), followed by UNESCO adoption during its 22nd General Conference. Each year, ICOMOS proposes a theme for activities to be organised by its members and partners - and anyone who wants to join in marking the Day.

This year's IDMS features the following theme: HERITAGE CHANGES.

In keeping with the spirit of open, innovative, constructive intergenerational dialogue, and the strategic focus of ICOMOS Triennial Scientific Plan 2021-2024, as well as the 2020 ICOMOS resolution on Approaches to Cultural Heritage. the IDMS 2023 features the following theme: HERITAGE CHANGES.

The IDMS - 18 April 2023 provides a timely opportunity to showcase strategies demonstrating the full potential of heritage research and practices which deliver climate-resilient pathways, while advocating for inclusive transitions to low-carbon futures.

The theme of HERITAGE CHANGES offers the opportunity to respond to questions regarding learning about traditional ways of knowing and knowledge systems in relation to climate action, and how to use a cultural heritage focus to support equitable protection of vulnerable communities through climate action, while responding to the UN Decade of Action.