Designing a museum is always an exciting architectural challenge. Museums often come with their own unique needs and constraints--from the art museum that needs specialist spaces for preserving works, to the huge collection that requires extensive archive space, and even the respected institution whose existing heritage building presents a challenge for any new extension. In honor of International Museum Day, we’ve selected 23 stand-out museums from our database, with each ArchDaily editor explaining what makes these buildings some of the best examples of museum architecture out there.

For many centuries, the demands of gravity appeared to give architecture one requirement that was largely unquestionable: that structures must rise vertically. However, with the advent of steel it was revealed that this limit had not been provided by gravity but by our own limited technologies. In this text, originally published by Domus Magazine in Italian and shared with ArchDaily by the author, Alberto Campo Baeza reflects on the architectural freedom offered by steel structures and the arbitrariness they bring to architectural space.

Isaac Newton was resting under an apple-tree in his garden when an apple fell on his head. Being endowed with such a privileged head and thoughts faster than lightning, he rose forthwith from his afternoon nap and set about calculating the acceleration of gravity.

Had Sir Isaac Newton had a little more patience and had he taken his time in getting to his feet, he might have noticed how, following the apple, a few leaves also fell from that same apple-tree, and while they fell, they did so in quite a different manner to the apple.

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