Sources and original illustrations

Primary references and the limits of this educational collection.

Primary references

• Vienna Tourist Board: Ringstrasse buildings — Contrasting historical styles and institutional buildings on the Ringstrasse.
• Bratislava Tourist Board: Petržalka — Distinct Danube-bank urban fabric and public-space contrast; no cycling itinerary copied.
• Berlin State Museums: Museum Island visit — Separate venues, ticket choices, current entrance notices and Pergamon closure information.
• Dresden municipal townscape strategy — Frauenkirche and Neumarkt reconstruction within the changing inner city.
• UNESCO: Kutná Hora — Distinct historic-center and Sedlec cathedral components.
• Budapest official Buda heritage tour — Castle district, civic quarter and views across the Danube to Pest.
• Wieliczka Salt Mine: tourist route — Guided underground route, stair descent, lift return, chambers and exact visitor conditions.
• Gdańsk Tourism: city introduction — Hanseatic maritime trade, Main Town and surviving civic architecture.
• UNESCO: University of Coimbra — Alta and Sofia, hill setting, multiple institutional buildings and periods.
• Alhambra authority: visit timing — Nasrid Palaces access time differs from wider complex visit; exact current terms govern.
• Visit Valencia: Turia Gardens — Former riverbed, changed river course, bridges and linear city-park geography.
• Bilbao official family walks — Estuary as city spine and industrial-to-contemporary urban change.
• UNESCO: Ravenna monuments — Eight distinct early Christian monuments and mosaic significance.
• Pompeii Archaeological Park: visit information — Official entrances, ticket distinctions, building access and designated accessible route.
• Navigazione Laghi: Lake Como services — Dated timetables, ordinary and fast service, vehicle ferry limitations and notices.
• Ljubljana Tourism: Triple Bridge — Plečnik pedestrian side bridges, river axis and links with market.
• Plitvice Lakes National Park: lake programs — Entrance-specific official circuits, boats and panoramic vehicles; live operation remains separate.
• Tallink: Helsinki–Tallinn journey — Operator-specific terminals and check-in conditions; no claim for every ferry company.
• LiveRiga: Alberta Street — Early twentieth-century Art Nouveau façades and separate museum context.
• UNESCO: Strasbourg — Grande-Île and Neustadt as linked but distinct urban histories.
• Kutná Hora municipal visitor guide — Distinct Sedlec cathedral and Cemetery Church of All Saints with ossuary; religious and memento-mori context.

Original visual material

The diagrams in this edition are original SVG illustrations explaining the sequence or decisions in each guide. They do not show a laboratory experiment, a personal trip or a tested product result. No photographs from the linked sources are reproduced.

Check the source in context

References were consulted during preparation of this edition. A source may cover a broader or narrower question than a particular guide; the support notes above explain why it is listed. Read the original for methodology, exceptions and updates.