From grand castles to resplendent cathedrals, Tallinn’s Old Town neighborhood, a UNESCO World Heritage Site, is the perfect place to begin exploring. Enter through Viru Väravad, or Viru Gate, the former fortress whose remaining two towers beckon you into the heart of the city.

Louisville is a city that knows how to make an impression. Birthplace of the Kentucky Derby, home to bourbon legends, and packed with stories that stretch back over two centuries, this river city blends tradition with bold creativity. Start downtown on West Main Street, also known as Museum Row. Here, visitors can tour the Louisville Slugger Museum & Factory, where real bats are still made, and marvel at the 120-foot baseball bat leaning against the building.

Located on the Adriatic, Koper is a coastal port city in Slovenia. Koper is home to a variety of architectural gems dating back centuries, especially near the city's central Tito Square. Koper's marina and beaches provide spectacular views of the Bay of Trieste, while the city's variety of museums, parks, restaurants, and bars offer plenty to explore and entertain.

Nestled along the south bank of the Danube, this historical Austrian city bursts with charm. A favorite stop on European river cruises, the city's most famous attraction is Melk Abbey, which dates back to the 11th century. The original Benedictine structure was lost to fires and foreign invasion, then rebuilt during the 18th century in lavish Baroque style, including a library and inner church covered in magnificent frescoes and gilded fixtures.

Glastonbury, a town in Somerset, England, is steeped in mysticism and historical allure. Known for its rich Arthurian legends and spiritual significance, Glastonbury is a must-visit for those fascinated by mythology and history. The town’s centerpiece is the majestic Glastonbury Abbey, a grand ruin once one of the most powerful monasteries in England. Founded in the 7th century, the Abbey is famously linked to the legend of King Arthur and his supposed final resting place.