An important landmark in the history of algebraic logic.

A restaurant with an extensive Irish whiskey bar also has several first editions of famous works by Irish authors.

This supermarket offers shoppers a window into the past alongside their groceries.

This is the largest cemetery in Ireland and the first cemetery museum in the world.

This pub built its reputation pouring post-shift pints for employees of the cemetery with which it shares a wall.

More than 5,000 artifacts donated by the people of the city, plus a room entirely devoted to the band U2.

Potato-peeling mannequins, Inca art, and a dangling tuber mobile help trace the history of fries at this Belgian museum.

This former Masonic lodge has been transformed into part museum, part bar, all awesome.

Drink among marionettes at this pub inside a historic puppet theater.

A fantastical 13th-century fortification sandwiched by a modern hotel in central Brussels.

From Tintin to the Smurfs, Europe's greatest graphic icons are celebrated in a grand Art Noveau gallery.

This collection of over 50 murals celebrates Brussels' rich history as the self-proclaimed home of the "comic strip."

The Devil’s own choice when he needs a drink in Brussels.

This Byzantine Church was moved from Paris to Athens block by block.

This abandoned shopping arcade has new life as an art installation.

View the ancient remains of buildings and the ancient "River of Hades" before hopping on a train.

Legend says it was constructed with the destroyed pillar of an ancient Greek Temple.

The oldest standing Byzantine church in Athens is tucked within a monastery in the middle of an upscale shopping district.

A Byzantine-era church hidden in a wooded area below the Acropolis.

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

A counter-culture bookstore like no other hides in plain sight in the streets of Paris.

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

Architecturally stunning library serves as the hub of Finnish scholarly life and culture.

A subterranean house of worship carved right out of the bedrock.