The stoutest tree in the world.

A towering spire in the fortress of Kalemegdan honors the victorious armies of Serbia during their struggles against the Ottoman Empire.

Destroyed Serbian army headquarters sits half crumbled in a largely revitalized Belgrade.

Where the lovelorn find a home for their sentimental keepsakes.

Bridge that died in war and was resurected.

A marvel of Byzantine engineering under the streets of Istanbul.

Roman ruins, natural methane fires and a lovely beach.

A Turkish monastery tucked into a cliff wall.

A sacred lake with thousands of sacred carp and a biblical history.

In this historic region, homes and churches are carved into ancient volcanic rock formations.

The secular incarnation of a religious meditation.

Two churches shoot bottle rockets at each others' bell towers in an unusual Easter celebration.

This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.

Monasteries on rock pillars, once accessible only by frayed ropes.