Sky ships, planes, and portraits left as unique tokens of hope and thankfulness.

This charming cobbled backstreet is the most Instagramable street in Paris, much to the residents' annoyance.

Elaborate tile work in this railway station tells the story of Portugal.

An unassuming music museum recounts the rags to riches story of a dramatic Portuguese genre.

This unique architectural wonder is also tied to one of the 20th-century's most renowned writers.

One of the smallest bookstores on the planet.

This Industrial Age architectural and engineering gem helps visitors and residents alike traverse Lisbon, “The City of Seven Hills.”

This 15th-century Ottoman bridge was modified to keep up with the changing course of the river Erenik.

This ominous Albanian fortress houses tanks and downed planes as a reminder of their victories over Western imperialism.

Hundreds of thousands of concrete bunkers crowd Albania long after the fall of Communism.

An Albanian monument to the Communism that nearly crushed the country is now a crumbling wreck.

Bronzes and busts that once stood in the city's main squares are now relegated to a small hidden courtyard.

Once the fallout shelter of a dictator, this sprawling bunker is now a combined history museum and contemporary art gallery.

In the hometown of the Catholic saint and Nobel Peace Prize winner, a memorial dedicated to her legacy.

A museum dedicated to the former country.

Destroyed Serbian army headquarters sits half crumbled in a largely revitalized Belgrade.

A pair of connected skyscrapers form this symbolic gateway.

A Serbian church lit by chandeliers made of weapons.

These medieval skyscrapers dominate the skyline of this small Tuscan town.

When this former hospital pharmacy closed in 2013 it already looked like a museum, so they turned it into one.

A hidden three-foot-wide house separates these two regal churches.

This historic streetcar system has been running since the 19th-century.

This restored Portuguese cafe may well be the most beautiful place in the world to grab a Big Mac.

Immortalized in bronze, this frazzled student will be glued to his screen for centuries.