【Hannah Harper Archives】

The Hannah Harper Archivesgreenest day of the year will always be St. Patrick's Day.

Cities around the world celebrated the Irish holiday on Sunday by turning their most famous landmarks green. It's amazing what a quick dye job can do to your standard government building.

SEE ALSO: Pornhub reveals what people are searching for to celebrate St. Patrick's Day

St. Patrick's Day commemorates St. Patrick and the first appearance of Christianity in Ireland. While there's so much more to the holiday than the color green, it's the color that's become synonymous with the celebration as well as with Irish culture.

Over the weekend, Ireland's official tourism account celebrated the holiday with photos of green-dyed or illuminated landmarks from around the world.

Here, for example, is the "Dancing House" in Prague.

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In Glasgow, Scotland, the Riverside Museum:

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The Great Wall of China also participated in #GlobalGreening:

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A gazebo in Livorni, Italy:

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The millennium bridge in Newcastle-on-Tyne:

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Bamburgh Castle on the north east coast of England:

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Cutty Sark in Greenwich:

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Crown Perth in Australia:

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The Peninsula Hotel in Hong Kong:

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In the Hague:

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Dubai:

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In Portugal:

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Over in Neushasen, Switzerland at the Rhine Falls:

Green water is good water Credit: MELANIE DUCHENE/EPA-EFE/REX/Shutterstock

And finally, in Chicago, home to some of America's best Irish pubs:

Cool green river waves Credit: KAMIL KRZACZYNSKI/EPA-EFE/REX/Shutterstock

Have a super green holiday, everyone.

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