Khmer Rouge's high security prison.

Built by King Norodom to honor his late father.

A Buddhist temple to honor insects that died for science.

An ordinary pond with fish from out of this world.

In this brilliant blue spring in Germany, legend has it that a sad mermaid learned to finally laugh.

A massive metal lobster welcomes tourists to a roadside restaurant.

Whitewashed mosque contains the world's largest carpet.

Where commuters walk through remnants of an ancient Greek necropolis.

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

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

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

Hundreds of thousands of concrete bunkers crowd Albania long after the fall of Communism.

A whimsical bridge adorned with decorative dragons.

This one-time health resort was used by aristocrats around the world.

The world's tallest church tower reveals a spectacular view to anyone up to the task of climbing the daunting staircase.

A small but immensely extravagant palace built by the "Night King."

The fairy tale castle of the "fairy-tale king."

The prototype for all Nazi concentration camps.

Go surfing on this urban wave, "hacked" by local surfers.

Daily jousts and dancing barrel makers in Munich's mechanical clock.

An opal mining town in the middle of Australia where people live, worship, and shop underground.