Basilica di San Petronio

Enormous, and famously unfinished — the marble facing stops halfway up the front and simply becomes brick. Inside is a meridian line laid into the floor in 1655, still accurate, with a hole in the roof that puts a disc of sun on it at noon. Free, and a much stranger building than it first appears.

Build Basilica di San Petronio into a trip

It sits in Bologna. Start from what’s there.

Place data from OpenStreetMap contributors, licensed under ODbL.