White houses with blue domes, and idyllic beaches with beautiful sunsets can all be found on the Greek island of Santorini. Located in the Aegean Sea, this volcanic island also serves as a great home base for island hopping. You can easily visit other popular spots in the Cyclades, a group of Greek islands southeast of the mainland including Mykonos, Naxos and Paros, or some smaller, less crowded islands, such as Folegandros.

The Galapagos Islands are a small archipelago in the Pacific Ocean about 600 miles west of Ecuador. With a treasure trove of unusual native species not found anywhere else in the world, the islands are fascinating and delightful for both scientists and tourists.

Krakow, located in southern Poland on the banks of the Wisla River, is a beautiful and historic city. The city center, referred to as the Old Town, is a UNESCO World Heritage Site. Exploring its medieval streets and climbing Wawel Castle Hill—the most famous city landmark—is a thrill, but there’s so much more to see.