Trip: The Great European Road Trip

Built in 1905, this impressive basilica has been called the "Protestant St. Peter's." The crypt contains tombs of Prussian royals and you can climb up to the dome.

This is a small but elegant Romanesque cathedral in Puglia, southern Italy. Its facade features many interesting sculptures and a lovely rose window.

Nestled in the historic center of a hilltop town in Puglia, Troia Cathedral was begun in 1093 and combines Puglian Romanesque with Byzantine and Muslim influences.

Located in southern Italy, this is the second-most visited Catholic shrine in the world. It centers on the tomb of St. Padre Pio of Pietrelcina, a Capuchin friar, priest and mystic known for his devotion.

This magnificent ancient temple was built by Emperor Hadrian in 125 and converted into a church in 609. It is the oldest intact ancient building in Rome.

The Small Synagogue of 1840 is the oldest undamaged synagogue left in Germany, with an original Torah shrine, mikveh, and women's gallery. The lower level houses an exhibition on Erfurt's Jewish community.

Visible from nearby Arles on its hilltop, the Abbaye de Montmajour was mostly constructed in the 12th century and is now a World Heritage Site.

Nestled among lavender and sunflower fields, this medieval monastery is best known for its association with Vincent Van Gogh, who was treated for mental illness here in 1889–90.

Martin Luther preached the Reformation, got married, and baptized his six children in this twin-towered Gothic church. Inside, Lucas Cranach's huge Reformation Altar includes images of Luther as well as Christ.

Housed in a grand 16th- to 19th-century palace stretching along the Seine River, the Musée du Louvre (Louvre Museum) in Paris is one of the largest and most important museums in the world, displaying over 300,000 objects.

Dubbed the “Cathedral of the Rive Gauche,” Saint-Sulpice is one of the largest churches in Paris. It was constructed sporadically between 1646 and 1745 in the Late Baroque style.