A flamboyant five-story building in Bulgaria resembles a crawling snail.

This ancient theater, restored in the 20th century, lives on as a venue for dramatic and musical performances.

This building has two facades of clashing architectural designs.

Underneath this Byzantinian church lies a necropolis filled with ancient tombs and the ruins of previous churches.

A striking symbol of the Bulgarian capital.

"Holy Wisdom" overlooks the city that became its namesake.

Sofia's legislative center is continuously reinventing itself.

Beautiful scenery provides the backdrop for an abandoned coastguard facility.

400 million years of erosion shaped these fascinating seaside caves, which made an appearance on 'Game of Thrones.'

An Orwellian sculpture with eyeball cameras watches passersby.

A saintly relic hidden in a Prague church basement.

This cemetery overlooking the Benbulben rock formation is the final resting place of one of Ireland's most beloved poets.

These crumbling Latvian forts make for some haunting seaside ruins.

A brisk climb up this solitary peak leads to the origin story of a towering figure in Irish history.

A restored World War II Churchill Mark VII Tank now stands guard in Carrickfergus.

A replica memorializes the site where women were punished after the last witchcraft trial in Ireland.

This beautiful site is where the first transatlantic telegraph was sent from.

A preserved oak tree about 3,500 years old found in Riga, Latvia.

The statue of a legendary giant who carried Christ and shouldered the world's sins.

This enigmatic artifact remained buried in a churchyard for years.

A stone marker and sculpture in the city of Riga stake a claim for the very first community Christmas tree.

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