Tallinn, the capital of Estonia, is a city where medieval charm meets modern innovation. While the Old Town, with its cobblestone streets and historic buildings, is a must-see, there are plenty of unique and less-traveled attractions that offer a deeper glimpse into Tallinn's culture and history. Here are seven off-the-beaten-path tourist attractions in Tallinn that will enrich your visit with unforgettable experiences.Kalamaja DistrictOnce a traditional fishing neighborhood, Kalamaja has transformed into Tallinn's hippest area, known for its wooden architecture and creative spirit. It's a place where you can explore local design shops, cozy cafes, and street art. The Telliskivi Creative City, a former industrial complex turned into a cultural hotspot, is a highlight here. It's free to wander around, and you can often find discounts at the shops during special events or late-night openings.Location: Kalamaja District, Northwest of Old Town Tallinn. It's a short walk from the historic center, offering a stark contrast with its modern and bohemian vibe.Travel Tip: Don't miss the chance to visit the Balti Jaam Market, where you can sample a variety of local foods and find unique Estonian souvenirs.Nearby: F-Hoone is a trendy restaurant located in Telliskivi Creative City, known for its industrial chic ambiance and delicious international cuisine.Patarei Sea Fortress PrisonThe Patarei Sea Fortress Prison offers a haunting look into Estonia's past. This former sea fortress turned prison is now a museum, showcasing the grim reality of life behind bars during Soviet times. Admission is usually very affordable, and the experience is both educational and moving. Check their website for occasional free admission days or guided tour discounts.Location: Kalaranna 28, 10415 Tallinn. It's situated right on the coast, offering stark sea views that contrast with its dark history.Travel Tip: Make sure to visit the exhibition Communism is Prison, which provides a powerful insight into the impact of Soviet rule in Estonia.Nearby: After your visit, take a short walk to the nearby Café Klaus for a relaxing coffee break by the sea.Lennusadam (Seaplane Harbour)The Seaplane Harbour is an exciting maritime museum housed in an architecturally unique seaplane hangar. It features a range of exhibits, including a submarine from the 1930s. While it's becoming more popular, it's still a gem that's slightly removed from the main tourist track. Ticket prices are reasonable, and there are often family discounts available.Location: Vesilennuki 6, 10415 Tallinn, Estonia. Located in the Kalamaja district, it's a bit of a walk from the city center but well worth the visit.Travel Tip: Don't miss the chance to climb aboard the submarine Lembit and experience the tight quarters where sailors lived and worked.Nearby: Peatus is a unique bar and restaurant set in old train carriages, just a short walk from the museum. It's a great spot to grab a bite and reflect on your maritime adventure.Kadriorg Art MuseumNestled in the beautiful Kadriorg Park, the Kadriorg Art Museum is housed in a stunning Baroque palace built by Peter the Great. The museum specializes in older paintings, sculptures, and graphic arts from Western Europe and Russia. While the museum charges an entrance fee, it's free on the last Thursday of every month. The serene park setting makes it a perfect cultural escape.Location: A. Weizenbergi 37, 10127 Tallinn, Estonia. The museum is set in the idyllic Kadriorg Park, east of the city center.Travel Tip: Take a stroll through the surrounding Kadriorg Park to enjoy the beautifully landscaped gardens and the Swan Pond.Nearby: Katharinenthal is a delightful café and patisserie in Kadriorg Park, offering a selection of pastries and light meals in a charming setting.St. Catherine's PassageSt. Catherine's Passage is a hidden walkway that connects Vene and Müürivahe streets in the Old Town. Lined with artisan workshops and medieval remnants, it provides a quieter, more intimate experience of Tallinn's historic heart. It's free to explore, and you can watch craftsmen at work, perhaps picking up a unique handmade souvenir.Location: Between Vene and Müürivahe Streets, Old Town Tallinn. This narrow alleyway is a hidden treasure amidst the bustling tourist areas.Travel Tip: Visit the passage during the early morning or late evening to avoid crowds and capture the perfect photograph of this atmospheric lane.Nearby: The cozy Chocolaterie Pierre offers handmade chocolates and a warm atmosphere, perfect for a sweet treat after exploring the passage.Nomme MarketNomme Market is a local secret where you can experience the daily life of Tallinn's residents. This suburban market offers fresh produce, meats, and other goods. It's a great place to sample local foods and interact with vendors. There's no cost to browse, and you'll often find better prices here than in the city center.Location: Turu plats 8, 11614 Tallinn, Estonia. Located in the Nomme district, it's a bit off the central path but accessible by public transport.Travel Tip: Try some traditional Estonian black bread or pick up some local honey as a sweet souvenir from your trip.Nearby: Kohvik Sesoon is a popular café among locals, offering seasonal dishes and a cozy atmosphere not far from the market.Kiek in de Kök and Bastion TunnelsThe Kiek in de Kök is a 15th-century artillery tower that now serves as a museum. Its name means Peek into the Kitchen in Low German, as guards could see into the kitchens of nearby houses from its high vantage point. The museum's highlight is the Bastion Tunnels, a network of hidden underground passages. The entrance fee is modest, and the experience is a fascinating journey through Tallinn's defenses. Look out for combination tickets that offer access to other museums at a discount.Location: Komandandi tee 2, 10130 Tallinn, Estonia. The tower and tunnels are located beneath Toompea Hill, offering a unique perspective of the city's fortifications.Travel Tip: Be sure to join a guided tour to learn about the tunnels' history and to navigate the labyrinthine passageways safely.Nearby: Rataskaevu 16 is a highly-rated restaurant in the Old Town, known for its cozy atmosphere and traditional Estonian dishes, just a short walk from the museum.Exploring these lesser-known attractions will give you a richer understanding of Tallinn's history, culture, and contemporary life. Whether you're wandering through bohemian neighborhoods, delving into maritime history, or stepping back in time in medieval passages, Tallinn's hidden gems are waiting to be discovered.