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

An eerie, derelict amusement park in Berlin.

A tour of underground Berlin takes you through WWII air raid shelters and tunnels used to smuggle people out of East Germany.

A surreal museum of extraordinary industrial objects.

The largest free-standing aquarium in the world resides in a hotel lobby in Berlin.

A museum dedicated to the history of a terrifying secret police is now held in their former headquarters.

A wunderkammer of mysterious objects and stories.

Art and a pun, all in one.

This grubby wall is said to be one of the Earth's esoteric energy centers.

Beneath Kraków Old Town's main square lies a hologram-filled medieval market vampire graveyard wonderland.

Come to this Polish museum to take a good, clean look at filth.

Memorial to the lost dead of Gdansk, whose resting places were destroyed during World War II.

The site of the first battle of World War II.

A haunting deserted hotel is a favorite with artists and photographers.

The largest toy museum in Poland showcases Europe's history of childhood.

On this Polish road, an optical illusion makes cars seem to roll uphill.

Once a giant gingerbread factory, this space now hosts exhibits and workshops on the historic treat.

This colorful and quirky set of pegasus sculptures celebrate the works of poet Zbigniew Herbert.

A delightful museum entirely dedicated to the tiny homes of dolls.

Tucked away inside this concrete building is a church and its grand display of brutalist architecture.

Europe's largest collection of matchbox designs is a fascinating exploration of the cultural history of the world.

The best place in the world to buy tinned fish.

Catering to broken dolls for almost 200 years, this repair shop is now a charnel house of doll parts.

An early Portuguese serial killer's head is alarmingly well preserved in a jar at the University of Lisbon.