# Invisible Serdica > Sofia's hidden historical and architectural treasures with multimedia and stories. (iPhone/iPad app by SDRUZHENIE STUDENTSKO OBSHTESTVO ZA KOMPYUTARNO IZKUSTVO.) - Source: https://appshunter.io/ios/app/invisible-serdica/id860755198 (this page in markdown: same URL + `.md`) - Developer: [SDRUZHENIE STUDENTSKO OBSHTESTVO ZA KOMPYUTARNO IZKUSTVO](https://appshunter.io/developer/860755201) - Category: Travel, Education - Price: Free - Rating: 5.00/5 from 1 App Store ratings · 5 written reviews indexed - Age rating: 4+ - Requires: iOS 10 · 3 MB - Languages: English - Released: 2014-04-18 - Data updated: 2026-07-16 - Monetization: free - User reviews in markdown: https://appshunter.io/ios/app/invisible-serdica/id860755198/reviews.md ## What is Invisible Serdica? “Invisible Serdica” is a free application that gives you the opportunity to explore the hidden and most attractive historical and architectural treasures of Sofia, the capital of Bulgaria, by providing images, videos, 3D models and interesting stories and legends about the locations, different from the standard information you will find in any tourist’s guide. As a start-up several key places were chosen: 1/ “St. Sofia” Church 2/ “St. George” Rotunda Church 3/ The Amphitheatre of Serdica 4/ The Largo (incl. the places around and also hidden beneath) 5/ The tombs hidden below the square of the National Assembly and around it and others Most of the content included in the application is taken from old books, which contain unique information, gravures, images and drawings. The idea is to make this interesting but not well-known data available for the wider public and thus make the most inspiring places in Sofia (its former Thracian and Roman name being “Serdica”) even more attractive. Another, also important aim of the application is to promote NALIS catalogue by providing links to books and other published works (that are related to the places chosen) included into the catalogue. “Invisible Serdica” application can be useful not only for the users of NALIS’s web site and catalogue and bibliophiles, but also for tourists and visitors of Sofia, as well as for students and teachers and serve educational purposes. - „Невидимата Сердика“ е безплатно приложение за мобилни телефони, което дава възможност на потребителите да научат повече за скритите и най-впечатляващи исторически и архитектурни обекти в София, столицата на България, посредством изображения, видео материали, 3D модели, интересни истории и легенди за подбраните обекти, различни от стандартната информация в пътеводителите. Като начало бяха подбрани няколко ключови обекта: 1/ Църква „Св. София“ 2/ Църква Ротонда „Св. Георги“ 3/ Софийски римски амфитеатър 4/ Ларгото (включ. обектите около и под него) 5/ Гробниците под жълтите павета и други Като източници за по-голямата част от съдържанието в приложението са използвани стари книги и поместените в тях уникална информация, гравюри, изображения, чертежи и др. Идеята на приложението е да разкрие и направи достъпна за по-широк кръг потребители тази интересна, но малко известна информация и по този начин да направи най-вдъхновяващите обекти в София (чието тракийско и римско име е било „Сердика“) още по-привлекателни. Друга, също така важна, цел на приложението е да популяризира НАБИС каталога като включва линкове към книги и различни публикации, поместени в него и свързани с избраните пет обекта. Приложението „Невидимата Сердика“ може да е полезно не само за ползвателите на НАБИС каталога и библиофилите, но и за туристи и посетители на София, както и за ученици, студенти и преподаватели с образователни цели. ## Key features - Historical site exploration - Images and videos - 3D models - Unique stories and legends - NALIS catalog promotion - Educational content ## Recent user reviews (5 of 5) All indexed reviews: https://appshunter.io/ios/app/invisible-serdica/id860755198/reviews.md ### 5/5 — Mr *2014-05-29, version 1.2* Nice concept, to tell about the objects using old books. ### 5/5 — very unique *2014-05-13* This application really helps you to discover interesting hidden places in Sofia! 5 stars! ### 5/5 — Ms *2014-04-24, version 1.0* It is really useful and interesting application. ### 5/5 — Great application! *2014-04-24* Sofia has a lot to show to its visitors as archeological remains. This small application could be of great help for everybody who is not familiar with them. Good luck! ### 5/5 — ms *2014-04-21, version 1.0* Very useful! Interesting info, try it :) ## Frequently asked questions about Invisible Serdica ### What historical sites does Invisible Serdica cover? Invisible Serdica focuses on key historical and architectural sites in Sofia, Bulgaria. Initially, it includes "St. Sofia" Church, "St. George" Rotunda Church, the Amphitheatre of Serdica, The Largo area, and tombs near the National Assembly square. ### What kind of content does Invisible Serdica offer for each site? For each location, Invisible Serdica provides images, videos, 3D models, and interesting stories and legends. This content is drawn from old books and unique historical sources. ### Is Invisible Serdica available on Android devices? Based on the provided data, Invisible Serdica is currently supported on iPhone and iPod devices. Information regarding Android compatibility is not available. ### How often is Invisible Serdica updated? The application was last updated on November 19, 2025, with version 1.5. This indicates a recent update, suggesting ongoing development and content additions. ### What is the age rating for Invisible Serdica? Invisible Serdica has an age rating of 4+. This means it is suitable for children aged 4 and above, making it accessible for educational purposes for younger learners. ### Does Invisible Serdica have ads? No, Invisible Serdica does not contain advertisements. The application is completely free to use without any ad interruptions. ### What is the user rating for Invisible Serdica? Invisible Serdica has received an excellent rating of 5.0 stars from one review. This indicates a highly positive user experience based on available feedback. ### What is the main purpose of Invisible Serdica besides exploration? An important aim of Invisible Serdica is to promote the NALIS catalog by providing links to books and publications related to the featured historical sites. This serves to connect users with further resources for deeper study. ## Version history (last 5 releases) ### 1.5 — 2025-11-19 Crashfixes and improvements ### 1.4 — 2022-05-17 Minor changes in the text. ### 1.3 — 2018-12-28 Minor changes in the text. ### 1.2 — 2014-05-28 Improvements in the interface. ### 1.1 — 2014-05-08 Improvements in the interface - icons, interactivity etc. ## More apps by SDRUZHENIE STUDENTSKO OBSHTESTVO ZA KOMPYUTARNO IZKUSTVO - [Event_Master](https://appshunter.io/ios/app/event-master/id980595680) - [Green Skills](https://appshunter.io/ios/app/green-skills/id989153193) - [Kulutra path](https://appshunter.io/ios/app/kulutra-path/id1624757664) All apps by SDRUZHENIE STUDENTSKO OBSHTESTVO ZA KOMPYUTARNO IZKUSTVO: https://appshunter.io/developer/860755201 --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-07-16.*