This beautiful 12th-century basilica on Burg Square houses a very sacred relic - a vial said to contain the coagulated blood of Christ, collected at the crucifixion by Joseph of Arimathea.

Begun in 1141, the Cathedral of Our Lady in Tournai is a UNESCO World Heritage site and one of the most striking examples of Romanesque architecture in Europe.

Built from the 13th to 15th centuries, the Onze-Lieve-Vrouwekerk has a soaring spire that can be seen for miles around. And inside is a great treasure: the only sculpture by Michaelangelo outside Italy.

This peaceful abbey dates from medieval times but has been used for government offices since the French Revolution. The abbey church has a beautifully simple barrel-vaulted nave.

Built from 1352 to 1520, Antwerp's magnificent Gothic cathedral is the pride of the city. It is the largest church in the Low Countries and houses four original Rubens masterpieces.

Antwerp is home to about 15,000 Jews and one of the largest ultra-Orthodox communities in the Diaspora. The city's 30 synagogues are all Orthodox.

The Église Sainte-Marie is a large Byzantine-style Catholic church near the Royal Palace. Now located in a predominantly Muslim neighborhood, it is mainly used for concerts and ecumenical functions.

Built in 1878, the Great Synagogue of Brussels is housed in a building often described as "stately Romanesque." The synagogue is active and hosts several Jewish organizations as well.