Trullo buildings in Alberobello, Apulia, Italy

If fairy tales had architects, they might've come up with something like Alberobello in Italy.

But instead of magic wands, it was limestone, mortar-free masonry and—according to some theories—a bit of tax evasion that built this town's signature homes: the trulli.

These are whitewashed stone houses topped with dry-stacked limestone roofs shaped like upside-down ice cream cones.

It's an ancient building technique and in this case, a clever one.

Back in the 14th century, locals were reportedly trying to avoid property taxes by constructing homes that could be quickly dismantled when the king's tax collector came around.