Padua Botanical Garden

Planted in 1545 to grow medicinal plants for the university's medical students, the Padua Botanical Garden is the oldest academic botanical garden in the world still standing on its original ground. It has never moved and never changed purpose, which is precisely why UNESCO listed it in 1997. It is also, on most days, close to empty -- a walled circular garden five minutes from the Basilica of Saint Anthony that almost no day-tripper reaches.

This is a working university research and teaching garden, not a park. Beds are labelled and studied; staying on the paths and not handling the plants is the whole of the etiquette, and it matters more here than in an ornamental garden because specimens are under observation.

Some of the collection is genuinely poisonous and grown deliberately, which is another reason not to touch.

Ticket income supports a living scientific collection with a five-century record. It is one of the more clearly worthwhile admissions in the city.

The garden's quietness is its character and its fragility at once. It absorbs visitors easily at current numbers, and coming here rather than adding to the queue at a busier site is genuinely useful to Padua.

The garden is ticketed, with a combined ticket covering both the historic circle and the Garden of Biodiversity. It keeps daytime hours that shorten considerably in winter, and is closed on some Mondays -- worth checking before making the walk. It is about twenty-five minutes on foot from the railway station, or a short walk from the Basilica.

Allow at least an hour. Most of the visit is outdoors, so the weather matters here more than at Padua's indoor sights.