As the Dead Sea continues to deplete, massive sinkholes open along its banks.

This daunting 1st century fortress was purportedly the site of one of the most dramatic revolts of the Jewish-Roman wars.

The home of the Dead Sea Scrolls is an abstract modernist dream.

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

Vienna's diversity-themed traffic lights were inspired by the Eurovision Song Contest.

This historic stone bridge has an entire neighborhood clinging to its sides.

A castle from the Holy Roman Empire that hosts traveling youth... in its stables.

This lurid German fountain plots the sad course of marriage from dating to death.

This abandoned coliseum was intended to be a grand Nazi rallying ground before it was halted at the end of the war.

The prototype for all Nazi concentration camps.

A monument to the three wars that led to German unification towers within a Berlin traffic circle.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

The footprint of a frustrated devil in Munich's Cathedral.

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

A stairway to heaven, or to nowhere at all.

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

A unique opportunity to stay the night in retrofitted sections of sewer pipe.

This one has sailed five times as far as Sir Francis Drake's famous ship.

An extraordinary collection of scientific instruments - and Einstein's chalkboard - inside the world's oldest purpose built museum building.

This ornate English estates "Prodigy House" still bears the cannonball marks of civil war.

Mysteriously stacked storefront paths give this medieval British town an iconic style like none other.

The western face was supposedly left clock-less to snub the Welsh.

19th century tunnels burrowed under Liverpool.

The red letters in the literary pavement leading to the library form a mysterious code.