Explore the cities and islands of Sweden, Latvia, Estonia, Russia, and Finland—five of the nations bordering the Baltic Sea—at the height of summer when sunlight extends into the evening hours and temperatures are mild. Begin and end in the cosmopolitan Swedish capital of Stockholm. Sail to the remote Swedish island of Visby and the Baltic states of Latvia and Estonia, where port cities boast untouched medieval quarters. Enjoy the grandeur of St. Petersburg with a specially arranged after-hours visit to the Hermitage and early entrances to the palace complexes of Peter the Great and Catherine the Great. Visit Helsinki, the capital of Finland, and cruise through a unique archipelago of 6,700 islands with a rich maritime heritage to reach the picturesque village of Mariehamn, the heart of the Åland Islands. Enjoy private musical events, including a medieval music concert in Tallinn, Estonia; a children’s folkloric performance in Riga, Latvia; and a string quartet concert in St. Petersburg. The 118-passenger Hebridean Sky, formerly known as the Corinthian II, underwent a $10-million refurbishment in 2016.