This coastal town in southwestern Namibia is known for its German colonial buildings, including the art nouveau Goerke Haus, built into the rock face on Diamond Hill. Nearby, Felsenkirche is a hilltop church with panoramic bay views stretching around to Robert Harbor. The Lüderitz Museum has displays about the town’s diamond mining past as well as local and natural history.

Noto is a hilltop city in southeastern Sicily, know for its carefully planned historic center and extensive use of warm-colored local limestone. Its main streets and squares are lined with churches, monasteries, palaces, and civic buildings whose carved facades create a unified architectural character.

Varna is a beautiful city along the Black Sea and a favorite port of luxury cruise ships.

Perugia, the capital of Italy’s Umbria region, is a city built across hills and centuries. Originally settled by the Etruscans more than 2,500 years ago, it still holds remnants of their civilization, including one of the largest surviving Etruscan arches in Italy named Arco Etrusco, which greets visitors at the city’s entrance. Walking through the narrow streets of the historic center reveals layers of Roman, medieval, and Renaissance architecture, all woven together within ancient stone walls.

Located on the southern coast of Norway, Kristiansand is a charming port city and a favorite summer destination for locals and tourists alike. Highlights of this coastal gem include the Christiansholm Fortress, the Kristiansand Zoo, the Kristiansand Cathedral, Gimle Gård, and the Fiskebrygga wharf.