These cost nothing and carry a full day each. Build around them and the paid tickets become optional extras instead of a budget drain.
TipPiet Blom finished these 38 yellow cubes tilted onto their corners in 1984, built as a village on stilts over the traffic at Overblaak so that residents live inside a tipped-up house with slanted walls and windows in the floor. Looking from the street is free at any hour; one unit, the Kijk-Kubus show cube at Overblaak 70, is furnished and open to visitors daily from 11am to 5pm for around 4 EUR, cash or card at the door with no booking. Twenty minutes inside is enough, and the stairs are steep.
TipUNStudio's bridge opened in 1996, 802 metres long with a 139 metre asymmetric pylon that gave it the local nickname De Zwaan, the Swan, and its southern span is a bascule lift that opens for tall ships. Walking across is free and takes about ten minutes, and the best light is the hour before sunset from the north bank at Boompjeskade. If the barriers come down, wait rather than reroute: a lift takes only a few minutes and you get to watch the deck swing up.
TipThis narrow harbour survived the 1940 bombing intact, which is why it is the only place in Rotterdam with leaning brick warehouses, gabled houses and moored wooden boats. The Pelgrimvaderskerk on the quay is where the Pilgrims held their last service before sailing on the Speedwell in July 1620 to join the Mayflower in England; the church keeps limited opening hours, usually a few afternoons a week, and asks only for a donation. The harbour itself is free and best at dusk, and metro station Delfshaven is eight minutes from Blaak.
Kralingse Plas and the snuff mills
FreeTipThe lake east of the centre is ringed by woodland and has two working mills on its southern shore, De Ster and De Lelie, which still grind snuff and spices between millstones. The path around the water is free at any hour and takes about an hour on foot or twenty minutes by bike, and De Ster opens to visitors on Saturday afternoons, when you can buy what it has ground that week. Swimming is allowed from the beach at the western end in summer.
Rotterdam Centraal station
FreeTipThe station that opened in 2014 is a piece of civic architecture rather than a shed: a stainless-steel hood angled to point at the city centre, a hall lined in Oregon pine, and a 28,000 square metre roof of solar cells over the platforms. It costs nothing to walk through, the lettering from the 1957 station has been kept above the entrance, and the underground bike garage holds more than 5,000 bikes. Stand on Stationsplein looking back at the point of the roof for the photograph.
Wilhelminapier towers
FreeTipA single pier on the south bank holds Rem Koolhaas and OMA's stacked De Rotterdam, Renzo Piano's leaning KPN tower, Mecanoo's Montevideo and the 1901 brick offices of the Holland America Line, now Hotel New York. Walking the length of it is free and takes twenty minutes, and the cheapest way to arrive is the water taxi from Veerhaven or Leuvehaven, which crosses in about five minutes for a few euros per person. The old departure hall at Hotel New York is open to non-guests for coffee.