Poland's oldest surviving university building holds a wealth of historic science instruments including some used by Copernicus.

A fairytale Gothic castle steeped in Nazi treasure conspiracy theories.

The site of the first battle of World War II.

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

An underground city of salt.

Named after a lodging site that existed nearby, a bridge has existed at this location since 1455.

In this small cemetery lies the grave of one of England's greatest football strikers, who died too soon.

Germany's last remaining Lenin statue has become a lightning rod of debate about the country's divided past.

Constructed by forced laborers, this submarine pen is now a museum and war memorial.

Hitler's bleak vision of relaxation still stands as a mostly abandoned 10,000-room resort complex.

A restaurant and observation deck built in a unique broadcasting antenna.

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.

On the Spree bank, discover one of the last reminders of a symbolic wall that divided, and was torn down by the people.

A fascinating insight into daily life in the Eastern Bloc.

This sculpture celebrates a boules tournament and the link between Leeds and its twin city Lille.

A 150-year-old steam locomotive crosses the southern half of the island daily.

The largest preserved walking dragline excavator in Western Europe.

The world's largest collection of preserved trolleybuses.

World's largest working waterwheel has been around for over 150 years.

Journey through this open museum where even employees remain true to period.

The world's first purpose-built motor racetrack was destroyed by the outbreak of two world wars.

This quaint funicular has been ferrying people up and down an English valley since the Victorian era.

One of the earliest large-scale "hyper" roofs in the U.K. is now a derelict roadside attraction.