Scattered throughout the Old Town, these twelve churches are among the oldest buildings in Cologne—most of them date back to the 12th and 13th centuries. They’ve all got that heavy Romanesque look, but each one’s a bit different. Great St. Martin stands out with its massive tower right by the river, St. Gereon has got an unusual oval dome, and St. Maria im Kapitol is one of the largest. You don’t need to see all twelve, but stopping in at a couple while you’re exploring the Old Town gives you a good feel for the city’s medieval side.

Groningen University Museum, established in 1934, showcases an eclectic mix of nature, culture and science. Highlights include historical medical instruments, the world's first electric vehicle from 1835, and a tribute to Dr Aletta Jacobs, the Netherlands' first female graduate. The museum's anatomical theatre has around 50 macabre anatomical preparations, as well as some skeletons and wax models. Check the official website to learn about the ever-changing temporary exhibitions.

Maio may be one of the most unfairly overlooked of the Cape Verde islands. It is true that tourist infrastructure is somewhat lacking, but that's part of its charm. Untouched beaches and sand dunes cover much of the island, though it is also home to a large forest, uncharacteristic in these parts. You may be able to catch a glimpse of a loggerhead turtle, as it has the second-largest nesting population in the archipelago.

At just over 430 metres high, Pico do Castelo feels a little different from the island’s other viewpoints. It’s greener, quieter, and layered with history. The summit is dotted with conifers, a rare sight on an otherwise dry island. A cannon and the remains of a 16th-century fortress, built to protect the population from pirate attacks, mark its past as a defensive lookout. You can reach the top either as part of the PR2 hiking trail or by tackling the short, steep climb from Vereda do Pico do Facho, which takes about 15–20 minutes on foot. The payoff is a wide view over much of Porto Santo, and on clear days, even Madeira on the horizon.