Coverage · France
Boulogne-sur-Mer
Boulogne-sur-Mer is northern France's great maritime city: France's busiest fishing port, a Roman-era fortified hilltop, and the largest aquarium in Europe all share the same stretch of the Opal Coast. The upper town's medieval ramparts still encircle a cathedral whose dome was built by a single obsessive abbé over thirty-six years, while down on the quayside fishermen sell their catch straight from the boat.
30+ researched places in the app
Places researched in this city
A selection of the 30 places we've researched in this city. The full set is in the Parroo app.
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Nausicaá, National Sea Centre
Architect Jacques Rougerie shaped the building to resemble a manta ray, and the 10-million-litre tank inside is the largest in Europe, housing 58,000 animals from 1,600 species. It opened in 1991 on the site of a casino that was destroyed in World War II.
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Upper Town (Fortified City)
This hilltop enclosure traces back to a Roman port called Gesoriacum, and the medieval walls built around it in the 13th century still stand intact. Inside, a UNESCO-listed belfry, a neoclassical basilica with a 101-metre dome, and Napoleon's former headquarters all occupy the same few cobbled blocks.
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Ramparts Walkway
Built between 1227 and 1231 by Count Philippe Hurepel on top of earlier Roman defences, the 1,500-metre circuit of walls with four gates and nine towers was classified as a historic monument in 1905. The walk above the rooftops gives unbroken views across the English Channel.
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Basilica of Our Lady of the Immaculate Conception
In 633, a crewless boat reportedly drifted ashore carrying a wooden statue of the Virgin, and a pilgrimage site has stood here ever since. The current neoclassical dome reaches 101 metres, built almost single-handedly between 1827 and 1863 by Abbé Haffreingue.
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Column of the Great Army
Napoleon's soldiers commissioned this 54-metre Corinthian column themselves in 1804, when the Grande Armée was camped nearby preparing an invasion of England that never happened. The bronze statue on top was switched from coronation robes to military uniform after the Bourbon restoration.
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The Sailors' Calvary
A calvary has marked this clifftop since 1703, and the current memorial garden records the names of more than 3,000 local sailors lost at sea. The structure is built to resemble a ship's hull, and a bronze Christ by sculptor Georges Saupique stands at its centre.
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San Martin House
The liberator of Argentina, Chile, and Peru spent the last two years of his life in this ordinary 19th-century townhouse on the Grande Rue, dying here in 1850. Argentina bought the building in 1926 and turned it into a museum, making Boulogne-sur-Mer an unlikely pilgrimage point for South American visitors.
Good to know
- How many places does Parroo cover in Boulogne-sur-Mer?
- 30 researched places, from the Nausicaá Sea Centre and the medieval Upper Town to lesser-known spots like the Sailors' Calvary. Each one has a short summary, a full article, and a ~3-minute audio story.
- Is there an audio guide?
- Yes. Every place has a ~3-minute audio story, written from the perspective of a guide standing next to you and produced with premium narration, not the article read aloud.
- Which languages is Boulogne-sur-Mer available in?
- German, English, and French. Pick whichever you'd rather read or listen in.
- Do I need to book anything or be online?
- No booking, no signup. It's a self-guided walk you start whenever you like. You do need a connection for now to stream the audio and load articles; offline support is something we're still building.
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Updated: 2026-05-29