Officially it’s called International Monuments and Sites Day, but that’s a tad unwieldy so April 18th is World Heritage Day in the common argot.

This year, the theme is “Religious Heritage and Sacred Places”, but the International Council on Monuments and Sites won’t send hired goons to your door or anything if you chose to celebrate other historical sites instead.

So go check out that pornographically opulent Beaux Arts building downtown you’ve been meaning to visit, or maybe go see what’s shaking at a local museum.