Breathtaking Byzantine paintings cover the inside of this 12th-century church.

Rusted structures stand like ghosts of Cyprus' 6,000-year-old copper industry.

Sofia's legislative center is continuously reinventing itself.

The mile-long pier stretches from a ruined fortress out into the Baltic.

A clerical error gave rise to this imaginary micronation in the southwestern corner of Estonia.

The oldest housing complex in Riga is a mini timeline of architectural trends.

Sweden's oldest animated sign is still lighting up the skyline today.

This gem from the industrial age helps visitors and residents alike traverse hilly Stockholm.

Legend has it that Napoleon Bonaparte fell in love with this Gothic church.

Some islands... they come, they go, especially on Lake Travis.

A gorgeous garden oasis with winding paths, stone bridges, and a troubling history.

Travelers who fall victim to this mermaid's charms are destined to stay in Užupis forever.

This stunning concert hall has become a symbol of Iceland's national recovery.

Iceland's tribute to its thankless civil servants.

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

At this rare mosque in Tbilisi, Sunni and Shia Muslims pray side by side.

This ancient monastery complex was transformed from an island to a peninsula when the lake was partially drained.

A towering monument to war, located on a beautifully peaceful hill.

Decades after testing the polio vaccine on unwitting patients, this historic mental hospital sits in ruin.

A medieval church built up to defend its village.

Nine centuries-old fortresses guard the walls of this medieval Romanian city.

A quirky bookstore hidden beneath a sea of whitewashed Greek villas.

The bust of Romania’s most notorious ruler, Vlad Dracula aka "Vlad the Impaler," keeps watch over the ruins of his medieval court.

This once-derelict building is now one of the most beautiful bookstores in the world.