Baroque Benedictine abbey on a rock above the Danube, with a gilded library of 100,000 books and frescoed marble hall.
Monasteries atop soaring rock pillars.
The largest surviving Romanesque church in Europe, built for pilgrims on the road to Santiago and topped by a five-tier octagonal bell tower.
Paris’s 850-year-old Gothic cathedral, reopened after the 2019 fire with its spire and oak roof rebuilt by hand.
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