An ossuary built in 1210 to collect bones from the Ospedale Maggiore of Milan.

Shimmering sea-colored mosaics and Jesus statues cover this opulent building.

A towering monument to war, located on a beautifully peaceful hill.

The entrance to this Frankfurt subway station looks like an old tram car crashed into the concrete sidewalk.

There are two dozen tanks just sitting in an open field in Lower Saxony.

This 8th-century Bavarian monastery is home to an exquisite Baroque-era library.

This Rococo church is known as the most beautiful village church in the world, and does not disappoint.

When a medieval fire claimed the original St. Stephen’s Cathedral, it sparked a pattern of unquenchable organ building.

Enter the cabin of a life-sized Hindenburg replica.

You haven’t properly toured a winery until you’ve slept in an actual wine barrel.

The architect of this fanciful complex called it an "oasis for humanity and nature in a sea of rational houses."

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.

An elegant chandelier hangs over this ancient sewer chamber, now open for concerts and public tours.

A former ironworks that was the first UNESCO industrial site.

An abandoned swimming pool decays on the outskirts of Berlin.

An elevator into the Baltic Sea.

A long spiraling walkway winds through the woods, and around a copper beech tree at the center.

Terrifying derelict military hospital once housed a recuperating Hitler.

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

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

The site of the famous Nazi book burning campaign of 1933 remembers its "Night of Shame".

A tree-like building perches on its trunk in the Steglitz neighborhood of Berlin.

A striking 12th-century-style castle built on the edge of a cliff.

Gardens representing parts of Asia, Europe, and the Mid East are tucked away among the Soviet-style buildings in East Berlin.