Visit Vatican City

Visit Monaco, the second-smallest sovereign state in the world. Explore the Prince's Palace (official residence of the Grimaldi family with daily changing of the guard), try your luck at the Casino de Monte-Carlo (iconic Belle Époque building featured in James Bond films), and stroll through the Jardin Exotique (botanical garden perched on cliffs with over 1,000 succulent plants).

Visit San Marino, the world's oldest republic founded in 301 AD. Explore the historic center of San Marino City, a UNESCO World Heritage site with medieval fortifications like the Three Towers (Guaita, Cesta, and Montale) offering panoramic views of the Italian countryside. See the Palazzo Pubblico (government building with Gothic architecture) and the Basilica di San Marino (neoclassical church housing relics of Saint Marinus).

The world's greatest Renaissance church.

A city built on water with no cars — gondolas, Byzantine mosaics, and getting happily lost in the back canals

Visit Luxembourg, a small landlocked country in Western Europe. Explore the UNESCO-listed Old Town of Luxembourg City with its fortifications and casemates, see the Grand Ducal Palace (official residence of the Grand Duke), walk across the Pont Adolphe (a stone arch bridge offering views of the Pétrusse Valley), and try local dishes like judd mat gaardebounen (smoked pork with broad beans) or gromperekichelcher (potato fritters).

Eat your way through Lima, South America's food capital, between colonial plazas and Pacific clifftops

The 50,000-seat amphitheatre where Rome staged its bloodiest spectacles for 2,000 years

Visit Krakow, the historic former capital of Poland, known for its medieval Old Town, Wawel Castle, and vibrant cultural scene.