What's the must-see thing in Venice?

The standard advice is 'ride a gondola.' Skip it. The regulated gondola tariff is steep for what amounts to a slow loop past facades you can see from the public ferry. The canal water in July smells like warm brine and old wood. The boat sits low enough that you're looking up at foundation walls, not the city. St Mark's Basilica is the thing in Venice that nothing else replicates. The building dates to 828 AD, rebuilt after a fire in 976, and the mosaics took Byzantine and Venetian craftsmen about 600 years to complete. Go when the doors open at 9:30am. By 11am the nave reaches its roughly 600-person capacity. Guards queue visitors outside in Piazza San Marco, where there is no shade and the July flagstones radiate heat. The tessera are glass cubes set at slightly different angles, so they catch light unevenly. In the first hour after opening, this makes the entire vault seem alive. By noon that stops.

The Doge's Palace stands at the southeast corner of the same square, 40 metres from the Basilica. Built from 1340, it operated as courtroom, prison, and seat of the Venetian Republic for over 450 years. The combined civic museums ticket costs €30, about $34 at current exchange rates. The Bridge of Sighs connects the palace's interrogation rooms to cells across the Rio di Palazzo. The name sounds romantic. The corridor is not. It is narrow, roughly 3 metres wide, with small barred windows that let in almost no light. Your footsteps echo off the stone. You might notice the exterior seems oddly graceful for a building that housed a state intelligence apparatus. Pink Verona marble columns and white Istrian stone lacework. That visual tension tends to catch people off guard. Book your timed entry the night before on the Musei Civici website. Walk-up queues in July run 45 to 90 minutes, and the ticket office closes when slots sell out.

Santa Maria della Salute sits at the tip of Dorsoduro where the Grand Canal opens into the lagoon. The Venetian Senate commissioned it in 1631 as a votive church after a plague that killed roughly 46,000 residents. Baldassare Longhena designed the octagonal structure and spent the rest of his career building it. He died in 1682, five years before the church was finished. Entry is free. The interior smells faintly of old incense and cold stone. It stays cool and dim even at midday, a relief after the exposed squares. Three Titian paintings hang inside, including ceiling panels from the 1540s. A Tintoretto Marriage at Cana covers the left wall of the sacristy. To be fair, the best view of the Salute is from the water, not from inside. Take the Line 1 vaporetto from San Marco Vallaresso toward Piazzale Roma. About 90 seconds after departure, the white dome and twin bell towers fill the left-side windows, reflected in the canal below.

Venice has no cars, no buses, no bicycles. You walk or ride the vaporetto. From the train station at Santa Lucia to Piazza San Marco is about 3.5 kilometres, roughly 40 minutes on foot if you follow the yellow directional signs. You will get lost. The alleys dead-end at canals with no bridge, and the numbering system follows sestieri, not streets, so a map helps less than you'd expect. The historic island covers about 5 square kilometres, though, so you can't go dangerously far wrong. Wear shoes with grip. The stone pavements get slick, and from October through February they flood at high tide, sometimes ankle-deep. In late July the temperature has been sitting around 27°C with moderate humidity. Tolerable in the morning, sticky by 3pm. Eat your main meal at lunch. Restaurants in Cannaregio and Castello run fixed-price menus for €15-20, while the same plates near San Marco cost roughly double.