This magenta statue commemorates the legendary marriage between a mermaid and the city's founder.

An expansive complex of subterranean tunnels is all that remains of one of Europe's most formidable medieval fortresses.

A WWII museum that tries to reenact history.

A creepy statue of a hooded ghost hauls itself up from the water in a historic Lithuanian city.

Liechtenstein's royal family calls this medieval alpine castle home.

The reconstruction of this prominent building fulfilled a long-written command.

Flamboyant architecture from the turn of 20th century.

A black cat protests the City Guild in Riga's Old Town.

Latvia's symbolic mountain-shaped national library is home to millions of cultural tomes.

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

A former Latvian headquarters of the brutal KGB secret police is now open as a grim reminder of their atrocities.

3,000 market stands in five former Zeppelin hangars.

This lonely minaret with an unusual decorative symbol is all that remains of a historic Ottoman mosque.

A 14th-century Serbian Orthodox church that was once converted into a mosque under the much-disfavored Ottoman Empire.

A UNESCO-protected spiritual seat of the Old Serbian Kingdom and Empire.

A devastating booze inferno poured through the streets, claiming several victims who drank it.

A guitar mounted on a wall in Temple Bar honors the Irish musician.

Designed to commemorate the king's coronation.

This single room has survived the centuries with almost no deterioration.

A monument to a beloved aquatic folk hero in the Irish town of Dingle.

This boat represents the promise of undiscovered territory, a dream of hope, and progress and freedom for Iceland.

Along this wire fence, travelers have been leaving a particular memento since 2012.

Instead of solid circles, the stoplights in this northern Icelandic town have glowing red hearts.

Three columns of volcanic rock shoot out of the ocean.