A spectacular Petrine Baroque summer palace commissioned for Catherine I by Peter the Great.

Palace where the nearly un-killable Rasputin was murdered.

An abstract monument to a symphonic composer.

The small alleys in Lübeck's Old Town are a result of medieval urban sprawl.

A little sculpture with a large wardrobe.

Some 80,000 Delft Blue tiles line the inside of this Amsterdam walkway.

The tradition of open-air secondhand and antiquarian bookselling in Paris dates back to the Renaissance.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

This small chapel is built of human bones and decorated with a golden skeleton.

The discovery of these rare, ancient artifacts led to the creation of a new museum.

This vast masterpiece of Moroccan architecture spreads across 20 acres.

The ancient heart of Tunis is an enormous maze of narrow streets and alleyways.

An out-of-place slice of France, smack in the middle of Shanghai.

A marvel of Byzantine engineering under the streets of Istanbul.

A 2,000-year-old computer demonstrates remarkable engineering and astronomical precision.

When a supermarket opened up shop within a medieval building it became protected by UNESCO on a technicality.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

The modern birthplace of Irish freedom.

Designed by Buckminster Fuller, this relic of the 67 Expo survived fire and ice.

Small ship votives hang from the vaulted ceiling of this port-side church with a Latin inscription on the wall.

A historic Montreal market that was the city's agricultural hub for over century.

A grand Gothic Revival basilica with stained glass depictions of Montreal's religious history has only one soul resting in its crypt.

One of Canada's oldest museums, the beautiful Redpath has been serving up Natural History and Ethnography since 1882.

A rather grand, but tiny, folly on the banks of the River Wear associated with a Polish count.