This modern arts center is built around a gem of late-Baroque architecture.

This off-limits room in the National Library of France is home to a system of pneumatic tubes, once used to bring books to readers.

This workshop and small museum is dedicated to tiny, delicate figurines that began as a subversive craft after the French Revolution.

A gothic church dedicated to the love of wine.

The world's tallest bridge is also possibly the most elegant.

A subterranean shelter remains intact under a busy Paris railway station.

The ruins of a medieval castle linked to the murderous French lord that inspired the famous legend of Bluebeard.

A medieval military street hidden beneath a charming French fishing village.

A mud statue stands in the dark tunnels, seeming to hold up the weight of the city above.

Walk upon the mementos of the dead in this Parisian courtyard paved with medieval tombstones.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

This massive library holds what was once the largest book collection in the world.

An empty relic of the Moscow Olympics crumbles away in Estonia's capital.

A secluded art gallery hidden within the cellars beneath Tallinn’s medieval monastery.

A former imperial sea-fortress and Soviet prison.

Finland's oldest astronomical observatory once played a crucial role in seafaring and timekeeping.

If you visit Santa's village, you can get your passport stamped to show you crossed into the Arctic Circle.

A cathedral resurrected from the ashes of one of Europe's greatest urban fires.

Roughly 17 million letters to Santa have found their way to this Arctic Circle post office.

A beautiful Arctic museum and nature center preserves the culture of the Sámi people.

This insurance company building reminds customers that witches, bears, and gnomes are out there, best be insured.

This irregularly shaped sea fortress has defended not one but three different sovereign states.

An abstract monument to a symphonic composer.

An alien church provides much needed silence in the midst of a Finland shopping center.