From toys to kettles to scientific instruments, this German museum celebrates the beauty of 20th century design.

A church filled with the bones of hundreds of virgins martyrs—or so they say.

Home to 10,000 medical specimens including the remains of Rudolf Virchow's extensive collection of pathological specimens.

Super-heavy Nazi architectural experiment.

Someone loved this song enough to carve all of its lyrics onto a tree trunk in a Berlin park.

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

A 12th-century fortress containing some of Berlin's oldest buildings.

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

Floating swimming pool within a moored vessel.

Blitzkrieg bop your way through Berlin's Ramones Museum.

An eerie, derelict amusement park in Berlin.

Ancient serpentine sacrifice holder that has stood the test of time.

A fountain standing as a testament to a doomed alliance.

The alleged house of the Virgin Mary is tucked away in a park and nature preserve on Mt. Koressos in Turkey and is holy to both Catholics and Muslims alike.

A small etching on the white marble parapet was written in runic script by a Viking mercenary.

Fantastic lake on the heart of a fault line.

This museum was invented in a novel before being made real by the author.

While not Turkey's deepest underground city, this subterranean redoubt is the largest.

Naturally protected city carved from a rock face.

Live a night as a Byzantine King, with a minibar and private jacuzzi.

A meow-velous tribute to a beloved street cat, made famous on the internet.

The ornate miniature mansions were built for Istanbul's feathered residents.

Seven early Christians were sealed into a cave where legend has it they slept unharmed for centuries.

Mediterranean castle on a tiny Turkish island.