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

This rose and lavender oil distillery still operates as it did more than a century ago.

These natural cliffs look like they are a part of an old castle complex.

Ruins of an early Roman Christian church dating back to the 4th to 5th centuries.

A mysterious tunnel hidden in the shadows of a colorful, historic sanctuary.

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

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

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

The second-largest Jewish temple in Bulgaria was deserted after World War II, seized by the communist government and then abandoned again.

In the summer, the area around this sculpture transforms into a vibrant concert venue.

These massive moving sand dunes have swallowed an entire village and are still on the run.

A program of Communist glamour in post-Stalin Poland is preserved in this colorful museum.

A mysterious structure left behind on the Polish mountainside, sometimes called "Hitler's Stonehenge".

A tribute to the Polish insurgents who fought in the failed attempt to end their city's Nazi occupation.