A zoo founded in the eighteenth century as the imperial menagerie, within the grounds of Schönbrunn Palace, and still operating on the same site — which makes it the oldest continuously operating zoo in the world.

At its centre stands the original baroque pavilion, once the imperial breakfast room, with the enclosures radiating from it in the original geometric layout.

Around that historic core, the zoo has been substantially modernised, with large naturalistic enclosures, a rainforest house, an aquarium and a polar section.

It sits inside the Schönbrunn park but has its own entrance and its own ticket. A palace ticket does not include it and a zoo ticket does not include the palace.

It is regularly ranked at or near the top of European zoo assessments.

The most common planning error at Schönbrunn is assuming the zoo is an addition to a palace visit. It is not — it is three to four hours on its own.

Tickets are bought at the zoo entrance or online.

Combination tickets link the zoo with the Palm House and the Desert House, both of which are close by in the same part of the grounds, and that is the sensible pairing.

Broader Schönbrunn passes and Vienna city passes may include it — check what yours covers.

Booking ahead is rarely essential but saves queueing on busy days.

Prices change periodically, so check the official site rather than any figure quoted elsewhere.

The giant pandas are the headline and draw the largest crowds, with a successful breeding history that is unusual outside China.

The polar bears have a large modern enclosure with underwater viewing, and are among the most praised exhibits.

Beyond those: elephants, big cats, penguins in a polar house, an aquarium and terrarium section, a rainforest house you walk through, and a substantial primate collection.

The historic pavilion at the centre is a café now and is worth going into for the building.

Feeding times and keeper talks are scheduled through the day and are the best-value part of the visit — check the board at the entrance and plan around two or three.

Worth an honest note. The zoo is widely praised for the quality and size of its modern enclosures, and it takes conservation and breeding programmes seriously.

A minority of visitors express reservations, generally about the older parts of the site or about particular species, and a few object to zoos in principle.

The historic geometric layout at the centre means some enclosures follow an eighteenth-century footprint that no modern zoo would choose, though these have been rebuilt behind the original facades.

If enclosure standards matter to you, this is at the better end of European zoos rather than the worse, and the reviews reflect that strongly.

The balance of opinion is clearly positive.

Three to four hours to see it properly, which is what most visitors report.

Two hours for a targeted visit to the pandas, the polar bears and the rainforest house.

A full day if you are adding the Palm House and the Desert House and taking your time.

The site is hilly in places and covers a substantial area, so the walking is more than people expect.

Do not attempt this and the palace interior and the Gloriette in one day with children. Pick two of the three at most.

Opening time is best. Animals are more active early, the enclosures are quiet, and the pandas in particular are easier to see before the crowd builds.

Mid-morning through mid-afternoon is the busiest, especially at weekends and in school holidays.

Late afternoon empties out and some animals become active again as the day cools.

Closing times vary substantially by season and are much earlier in winter — check before planning a late arrival, since the last admission is well before closing.

Feeding and talk times are the anchors to plan around.

August, December, July and October are the busiest.

January and February are the quietest.

Summer brings the crowds and the heat; several enclosures are indoors and air-conditioned, which makes them popular refuges on hot days.

Winter suits the polar section and the indoor houses, and the zoo is genuinely pleasant in cold weather with far fewer people.

December is busy partly because of the Christmas market in the palace grounds nearby.

Spring and autumn are the balanced choices — mild for walking and animals active.

The zoo is within the Schönbrunn grounds, and the choice of entrance matters.

Entering by the main palace gate means a substantial walk across the park to reach the zoo. Entering by the Hietzing gate, near the underground station of that name, puts you much closer.

The U4 underground serves both Schönbrunn and Hietzing stations; Hietzing is the better choice for the zoo.

Trams also serve the area.

Driving is possible with paid parking.

Check which gate is closest to the zoo entrance before you set off — this single decision saves a twenty-minute walk at either end of an already long day.

There are several cafés and restaurants within the zoo, including one in the historic baroque pavilion at the centre, which is worth going into for the setting.

Prices are as expected at a major attraction.

Picnic areas are available and bringing your own food is a sensible economy with a family.

Toilets are distributed around the site.

Pushchairs can be hired, and there are lockers.

The zoo shop is at the exit, which is the usual arrangement and the usual outcome with children.

This is one of the best family days in Vienna, and it is the part of the Schönbrunn estate that works best with children by a wide margin.

The pandas, the polar bears with underwater viewing, the penguins and the rainforest house are the reliable hits.

There are playgrounds within the grounds and a petting area.

The practical constraints are distance and duration — this is a long walk for small legs, so a pushchair or a planned shorter route matters.

Allow for a food stop and budget for the shop.

Combining the zoo with the maze in the palace gardens makes a full and satisfying family day without going near the state rooms.

The zoo is broadly accessible, with paved paths throughout and accessible toilets, and reduced admission for visitors with disabilities and a companion.

The site is on a slope in places, and some sections involve gradients that are hard work in a wheelchair without assistance.

Wheelchairs and pushchairs can be hired at the entrance.

Entering by the Hietzing gate rather than the main palace gate substantially reduces the distance covered.

The indoor houses are level and accessible.

The reviews are strongly positive, and the criticism is mostly about crowds at the pandas and about the older parts of the site.

The tiring version: enter by the main palace gate, walk twenty minutes across the park before you start, arrive at the pandas at midday with everyone else, and run out of energy halfway round.

The good version: enter by the Hietzing gate at opening, go to the pandas first while they are quiet, plan around two keeper talks, break for lunch in the baroque pavilion, and finish with the rainforest house.

It is the oldest zoo in the world and one of the best, it sits inside a Habsburg palace park, and it deserves a day rather than an afternoon squeezed after the state rooms.