Tucked beneath Cologne’s City Hall, this underground site gives you a glimpse of the city’s Roman past. You can walk through the remains of the governor’s palace and parts of the old sewer system—surprisingly intact.

Step back in time at the Titanic Museum Attraction in Branson, a tribute to the enduring legacy of the RMS Titanic. This interactive museum gives visitors a chance to explore the ship’s history and tragedy through over 400 artifacts from the original Titanic and its passengers. Designed to resemble the grand ship itself, the museum offers a hands-on experience, including walking the Grand Staircase, touching an iceberg, and feeling the icy water of the Atlantic. Each guest receives a boarding pass representing a real passenger or crew member, making the journey even more personal.

The Aviation Museum next Burgas Airport showcases Bulgaria’s aviation history with a collection of civil and military aircraft from the 1960s to 1990s. Highlights include the TU-154 and AN-12, among the last of their kind in the country. You can explore the interiors of several planes, including an interactive exhibition inside the AN-12, and even try a virtual reality flight simulation. A compact but engaging destination, it’s ideal for aviation enthusiasts or those with time before a flight.

The American Visionary Art Museum (AVAM) is one of Baltimore’s most unique cultural experiences, showcasing art created by self-taught visionaries—expect bold, colorful, and deeply personal works made from everyday materials, often tied to themes like hope, resilience, and imagination. The museum’s campus near the Inner Harbor includes three renovated industrial buildings, an outdoor sculpture garden, and a small but well-curated gift shop.