The Mercedes-Benz Museum is worth a few hours, even if you're not big on cars. Spread over nine levels, it walks you through more than 130 years of automotive history—from the first motorised carriage to modern electric prototypes—with around 160 vehicles on display. The building itself is a bit of an architectural talking point, designed like a double helix. Exhibits are well laid out, easy to follow, and occasionally rotate.

Loveland Castle, also known as Château Laroche, is a full-scale medieval-style castle built single-handedly by Harry D. Andrews, a World War I veteran, starting in the 1920s. Constructed using stones from the Little Miami River and bricks molded from quart milk cartons, Andrews dedicated over 50 years to this labor of love. When you visit, you can wander through the castle’s towers and narrow halls, check out some old-school medieval weapons, and just soak in the quirky, one-of-a-kind vibe. It's a fun and odd little stop with beautiful gardens and a peaceful riverside spot to hang out afterward.

Sandwiched between Switzerland and France, Lake Geneva (called Lac Léman in French) is a stunning natural gem known for its picturesque landscapes and beauty. One of the largest lakes in Europe, it offers breathtaking views of the Alps and the Jura Mountains. The lake's shores are dotted with charming towns and cities, including Geneva, Montreux, and Lausanne, as well as the iconic Chillon Castle.