The former Nazi Germany concentration camp stands as a museum to remember this dark chapter in European history.

A program of Communist glamour in post-Stalin Poland is preserved in this colorful museum.

An underground city of salt.

This Nazi ruin was the site where Hitler was almost blown up by a suitcase bomb.

The oldest warship in Europe is still afloat.

These engineering masterpieces are a dominant feature of the Belfast skyline.

The highest peak in the United Kingdom has a history of physics, specters, and a pilgrimage of strange objects.

The heads of two giant mythological water horses honor Scotland's horselord past.

A statue in the heart of Edinburgh honors a bear that served in the Polish military during World War II.

Old-fashioned knowledge and modern engineering create the world's only rotating boatlift.

3,000 market stands in five former Zeppelin hangars.

A book bound in the skin of an infamous criminal, along with countless other specimens.

Inside this art museum resides one of Glasgow's most famous musical instruments.

The last fully functional fortress of Germany's World War II Atlantikwall.

Europe's only museum solely dedicated to the history of whaling still has a fully-functioning whaling ship.

An impressive museum dedicated to the resource that made the Scandinavian country rich.

This city square is home to Amsterdam's oldest church and a statue honoring Dutch sex workers.

A six-ton wedding present for the King of the Scots.

An icon of the Battle of Britain is frozen in flight in a grand Victorian museum.

This irregularly shaped sea fortress has defended not one but three different sovereign states.

A small island dotted with old, historic Finnish buildings.

Disused seaplane hangar gets a second life as the jaw-dropping home of Estonia's museum of maritime history.

The design of this beautifully crafted building was inspired by Norwegian glaciers.

This floating sculpture of ice is a poignant reminder of nature's power.