Interactive museum of toys down the ages, child-friendly of course.
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This is a modern replica: the original was built in the 15th century, ruined in the 17th and demolished in 1801. A merchant's house was then built, which became part of the Arsenal. In the 1990s after independence the palace was rebuilt to the original plan, somehow without deciding what it would be used for, and to outcry as it blocked the vista from Cathedral Square. It's become part of the National Museum, with displays of palace history and reconstructions of the ceremonial halls.
This is the Upper Castle of a complex of three built from the 13th century, much bashed about, and abandoned from the 16th. (The Lower Castle became the site of the Arsenal, Palace and Cathedral, and the "Crooked Castle" was destroyed in 1394.) You can ascend the cobbled lane and enter the courtyard free for views of the city, and the Three Crosses on the hill east. The ducal palace east side of the courtyard is just a shell, converted into a performance space. West side is the three storey red brick tower, now a museum.
Šv Onos bažnyčia
Small flamboyant church in Gothic style, built by 1500 and little altered since. There is a legend that when Napoleon's campaigns brought him to Vilnius, he declared that he'd like to lift the church on his palm and carry it back to Paris. (Obviously untrue, since given the horrors of his retreat, he'd have been forced to eat it before he reached Warsaw.) St Anne's is not within Užupis but backs onto the river boundary by an entrance bridge.
Displays religious art.
Also known as the Bernadine Church, it is next to St Anne's on the riverbank. It's a sturdy Gothic building from the 16th century, incorporated into the city walls, with loopholes toshoot at the Cossacks.
Basilica of St Stanislaus and St Ladislaus of Vilnius
The first cathedral was built here in 1251, reverting to pagan worship in 1263. Fire destroyed a second in 1419, a third in 1530 and a fourth in 1610. Many parts of the fifth survive, notably the baroque chapel of St Casimir, but much was lost when the south tower collapsed in 1769 — did those pagans have a friend on high? What you see now is mostly the neo-classical structure completed in 1801. The crypt has a display of Vilnius through the ages, and you can also tour the catacombs and free-standing 57-m high belfry. Nearby in the square, a tile inscribed Stebuklas ("miracle") marks the end of the Vilnius-Tallinn human chain in the 1989 protest against the Soviet Union.