A marvel of Byzantine engineering under the streets of Istanbul.

A museum dedicated to the history and exploration of both popular music and science fiction.

A beautiful final resting place for some of the noteworthy deceased.

A walk through the historic city center, under the streets of Seattle.

A 100-year-old purveyor of curiosities, curios, and kitsch featuring mummies, shrunken heads, and a Fiji Mermaid.

A wall of chewing gum moonlights as collective art.

Berlin's old airport.

Cold war icon and onetime "hole" in the iron curtain.

Thousands of tourists and residents in Cologne affix "love padlocks" on the Hohenzollernbrücke Bridge to symbolize their affections.

This monument to those fallen in the World Wars is accompanied by a U-boat that Germany bought for a Deutsche Mark.

Ruins of a German castle on top of a towering stone pillar.

An exquisite panometer representing Dresden as it was from 1695 to 1760.

Over 12,000 hygiene oriented objects and exhibits.

The largest treasure hoard in Europe is contained in a castle that was bombed out during World War II.

When the rain falls, this drain system turns into a musical instrument.

This incredible stone temple is a monument to death, victory, and fantasy architecture.