Its frescoes depict the likeness of Marshal Tito, Karl Marx, and Friedrich Engels burning in hell.

A beautiful mountaintop mausoleum devoted to a Montenegrin icon can't seem to make everyone happy.

This exclusive resort has completely covered a tiny Balkan island in a 5-star warren of guest rooms.

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

A curious cave church carved into the face of a cliff.

Perhaps the most spectacular grotto along the Algarve coastline.

The extravagance of Portugal’s "Pink Palace" resulted in a noble title being awarded to its owner.

This small chapel is built of human bones and decorated with a golden skeleton.

Inside this mansion turned museum, the works of prominent Croatian artists are on full display.

A wunderkammer of gold and silver reliquaries and ancient saintly bones.

Gargoyle head that brings good luck.

A chain of 16 wondrous lakes formed as a result of the gradual dissolution of soluble layers of bedrock.

Rebuilt several decades ago, its striking murals prevent it from being reconsecrated as a church.

At this 16th-century monastery in rural Bulgaria, visitors can also spend the night.

A massive cave once a secret military base is now home to thousands of bats.

The Grand Mall in Varna hosts one of the biggest collections of Soviet-era paraphernalia in Bulgaria.

These cascading falls resonate throughout the Bulgarian forest.

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

A magnificent, glittering building tucked into a tiny Bulgarian mountain town.

A mountain pass in Bulgaria's Balkan Mountains was the site of four historic battles.

Outstanding, eerie frescoes and decorations fill this 19th-century monastery.

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

An ancient Thracian city where fire rituals were practiced on the largest cult altar in Southeast Europe.

A striking symbol of the Bulgarian capital.