The history and future of cannabis.

Real bones which are said to have belonged to a Polish dragon.

Poland's oldest surviving university building holds a wealth of historic science instruments including some used by Copernicus.

St. Mary's features one of the most spectacularly decorated cathedral interiors in all of Europe.

Inside this Krakow church, an explosion of psychedelic color.

The former Nazi concentration camp stands as a museum to remember this dark chapter in European history.

The last remnants of a massive medieval wall that once encompassed the city of Berlin.

Tiny memorials honor individual victims of the Holocaust.

A quaint Russian village in the middle of a German metropolis.

The "Prussian Versailles" that is as glorious today as when it was built.

A monument to the man who almost killed Hitler.

The bunker where Hitler took his own life is hidden under this deliberately ordinary parking lot.

This World War II bunker now survives as a documentation of the Nazi regime and war crimes.

A memorial in the Tiergarten is a reminder of the suffering inflicted on homosexuals by the Nazi regime.

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

The most visited, and possibly most controversial, museum in Germany.

This centuries-old hotel hides a network of secret cellars and passages once used by smugglers.

A house of bones — but nobody is quite sure to whom they belong.

One English town's celebratory landmark spurred more trouble than anticipated.

A winding cave grotto walkway built to provide employment for veterans after World War I.

Antiques by the Bay.

After serving in World War II and picking up Apollo astronauts, this aircraft carrier has been turned into a museum overlooking the San Francisco Bay.

This (occupied) house is 10 feet wide and full of spite.

Oakland's beautiful monumental cemetery.