Solar observatory doubles as a daring display of Expressionist architecture, much to Einstein's chagrin.

Metro station with a claim to rock n' roll fame.

Germany's Glienicke Bridge has a shady history of clandestine meetings, espionage, and spycraft.

The last bastion of Roman presence north of the Alps looms over a German town.

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

An ornate century-old elevator still connects the two halves of Bad Schandau.

Twisted buildings adorn the banks of the Rhine river.

Horrifically creative torture devices and shame punishments line the walls of this chilling museum.

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

Executed in 1401, Exhumed in 1878, Stolen in 2010.

Tiny memorials honor individual victims of the Holocaust.

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

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

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

This Dresden church was purposely rebuilt Protestant after being demolished in World War II.

These former Nazi anti-aircraft towers offer a singular view of the north of Berlin in the summer, and a sanctuary for bats in winter.

Retirement home for giant obsolete machines.

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

Dress up like a miner and take a slide into the disco-lit depths of this once foundational salt mine.

This water-tower-turned-high-end-apartment building was once the site of an early Nazi concentration camp.

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

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

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

In this truly magical place, rent hasn't been raised since the year 1520.