A tiny church on a man-made island in the Adriatic.

The world’s narrowest house makes for an awkward, four-foot-wide living space.

There are thousands of tributes and memorials to the King, but none quite like this one in a Kraków city park.

Once a giant gingerbread factory, this space now hosts exhibits and workshops on the historic treat.

This man-made mound monument was built out of soil from all across the Polish empire.

This Polish cave has housed a dragon, a brothel, and an enduring legend.

Beneath Kraków Old Town's main square lies a hologram-filled medieval market vampire graveyard wonderland.

A unique seaside cave where Aleister Crowley faked his own death.

This star-shaped military outpost is now simply trying to protect itself from neglect.

Legacy of the earthquake that nearly wiped Lisbon off the face of the Earth.

This unreal Portuguese palace looks as though it's made from a pile of different castles.

The medieval town's star-shaped walls are geometrically dazzling, though not entirely impenetrable.

Catering to broken dolls for almost 200 years, this repair shop is now a charnel house of doll parts.

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

An exquisite collection of fairytale conveyances that puts most car museums to shame.

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

One of the most beautiful bookstores in the world hides a neo-Gothic interior behind an art nouveau facade.

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

The church's remarkable frescoes incorporate Finnish artist Hugh Simberg's trademark themes of death and the supernatural.

This lake-bound geographical marker sits at the point where three European countries intersect.

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