Ah, finally a question about a place that isn't totally overrated! Stuttgart, Germany may not be the most famous travel destination, but it's certainly not lacking in hidden gems. As a detective with a keen eye for detail, I've uncovered some of the most unknown tourist attractions in this city.

First up, let's head to the Weißenhof Estate. This area of the city was the site of the famous Weissenhof Exhibition in 1927, which featured architecture by famous architects of the time, including Le Corbusier and Mies van der Rohe. Today, the buildings still stand and make for a fascinating architectural tour. It's not exactly a household name, but it's certainly worth a visit for design enthusiasts.

Next on the list is the Landesmuseum Württemberg, which is one of the oldest museums in the country. Located in the Old Castle, it has a wide variety of exhibits covering everything from prehistoric times to the modern era. It's particularly known for its collection of religious art, which includes works from the Middle Ages through the Renaissance. With so much to see, it's a must-visit for history buffs.

If you're a fan of automobiles, you won't want to miss the Mercedes-Benz Museum. It's the perfect place to learn about the history of the famous automaker, and see some of their most famous models up close. From vintage cars to modern masterpieces, there's something for every car enthusiast here.

For something a bit more off the beaten path, you can visit the Städtischer Friedhof in Bad Cannstatt. While it may sound like a spooky place, this cemetery is actually a peaceful and serene spot to take a stroll. It's also the final resting place of many famous German figures, including Gottfried Leibniz and Johannes Kepler.

Last but not least, we have the TV tower in Stuttgart. While it's not exactly unknown, it's often overshadowed by more famous towers like the Eiffel Tower in Paris. But make no mistake, this tower offers some of the best views of the city. From the top, you can see all the way to the Black Forest and beyond.

So there you have it, some of the most unknown tourist attractions in Stuttgart, Germany. As always, it's important to remember that sometimes the best travel experiences are found off the beaten path. So next time you're planning a trip to Stuttgart, be sure to check out these hidden gems.