The skyline of Montreal includes the silhouette of an unexpected fruit-shaped Canadian staple.

A Montreal deli that was so beloved that it was allowed to circumvent their laws of language.

Montreal's giant farmer's market is a foodie's best friend, especially in the winter months.

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

This 1967 experiment in modular architecture was designed to be a new model for urban living.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

The 28,000-year-old specimen is remarkably intact.

The remains of Martha, the last known passenger pigeon, serve as a tool to educate about conservation.

Look closely and you’ll notice that the color changes a third of the way up the tower.

A tiny monument to the unsuccessful attempt by Thomas Jefferson to place the prime meridian in Washington.

This mysterious structure by the Washington Monument is a flood barrier designed to protect the White House against rising waters.

There’s a hidden military meme engraved on the World War II Memorial.

The actual model from the original "Star Trek" series is now on display at the National Air and Space Museum.

The "lovely red Vega" of the legendary record-settling pilot.

While most wind tunnels test scale models, the "Cave of Winds" was large enough for actual airplanes.

Home to items never before seen by the public.

This stunning blue and gold room changed cities twice before becoming part of the Smithsonian.

Among the ostentatious rococo ornamentation of this church, an image of death cuts the life-thread.

A fearsome dragon clings to a corner of Munich's city hall.

Daily jousts and dancing barrel makers in Munich's mechanical clock.

A small but hugely whimsical theater where marionettes play out the "The Battle of Stalingrad."

This extraordinary, multi-pillared monument depicts the fascinating history of Georgia.

An important Mayan religious and trading center dating back to 200 BC.

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