Learn the fine art of making a centuries-old treat at this hands-on food museum.

The prototype for all Nazi concentration camps.

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

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

This "floating railway" is one of the world's oldest monorail systems.

A unique Holocaust memorial tells the personal stories of the Jewish residents exiled from greater Berlin.

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

A stairway to heaven, or to nowhere at all.

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

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

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

This jaw-dropping 19th-century bridge uses its reflection to form what appears to be a perfect circle.

The fairy tale castle of the "fairy-tale king."

While you wait to cross the street at a traffic light in Mainz, you might notice that the light is staring back at you.

A rare water-powered funicular, it uses a huge tank of water and gravity to do its work.

A collection of artworks exclusively created by the mentally ill that was almost burned by Nazi culture police.

Once a 19th-century brasserie, this McDonald's exterior celebrates Alsatian design and the "King of Beer."

This massive library holds what was once the largest book collection in the world.

A Jenga-style cylindrical tower of books that appears to go on forever.

An art deco ice cream shop covered in vintage train station tiles.

Unfinished monument to peace between Turkey and Armenia, long divided by a dispute over genocide.

The home-turned-museum of Barış Manço, the mustachioed Turkish Elvis for children.

Quite possibly the oldest love poem known to humankind.

This shuttered power plant is now Turkey's first industrial archaeology museum.