The historic Ex-USS Kittiwake became a home to sponges, Goliath groupers, urchins and squirrelfish since its sinking in 2011. Over the years, the underwater wreck has blossomed into a beautiful and dynamic artificial reef — the perfect refuge for marine life. Divers of all skill levels, as well as snorkellers, explore the shipwreck with ease, as it is only 17 metres (55 feet) deep.

Carol Reed’s “The Third Man” (1949) remains a landmark of film noir, iconic in its atmospheric portrayal of post-war Vienna, the Anton Karas’s haunting zither score, and Orson Welles’s performance as the enigmatic Harry Lime. Voted the greatest British film of the 20th century, it captured a city divided by Allied occupation — a world of shadows, rubble, and moral ambiguity — while showcasing both Vienna’s grand landmarks and its gritty sewers. Operated by passionate private collectors, The Third Man Museum displays over 3,000 artefacts, from original scripts and film props to period documents illustrating Allied-occupied Vienna (1945–1955). The collection spans 16 rooms, offering deep context into the film’s production and its historical backdrop. Guided tours (75 minutes, in English) delve into cinematography, the impact of the zither score, and the city’s complex post-war reality. Note: cash only for entry. The above-ground Third Man Walking Tour, offered by independent guides, visits key filming locations in the Innere Stadt, including Josephsplatz and Mölkerbastei. Using film stills and audio clips, it recreates the film's mood while exploring Vienna’s historic centre. It focuses on the architectural and urban settings that shaped the story, without entering the sewers. Another tour, 3. Mann Tour – Sewer, descends into the functional sewers where the film’s climactic chase was shot. You’ll traverse walkways above flowing wastewater while projections of film scenes play on tunnel walls. It’s an immersive, if somewhat damp, experience. Tours are popular and require advance booking.

Originally named Mammoth Cave, California Cavern has been a popular attraction in Calaveras County since 1850. They specialize in 1-hour walking tours and caving expeditions through California's longest cave system. Tours are milder than the expeditions, which vary in difficulty and length.

Perched on the hill between the Forum and the upper part of the city, you will find the 14th-century church and monastery of St Francis of Assisi. Now used to house a remarkable collection of stone monuments and copies of Istrian frescoes, the church also hosts classical music concerts in the summer months.