Model Trains and Much More in Hamburg.

Once the tallest building in the world, this abandoned church is now a monument to the destruction of WWII.

A plaque bearing the names of those who dedicated themselves to protecting Budapest's Jewish population during World War II.

Hungarian Jews were ghettoized during the Second World War, but little remains of the original wall that closed the Jewish people off from the rest of the city.

The metal leaves on this tree are engraved with the names of Holocaust victims.

A museum dedicated to a secret military hospital hidden beneath a castle in Budapest.

Museum dedicated to the terror regimes of Hungary.

A Trabant car, a kangaroo statue, and a plethora of plants take over this abandoned-factory-turned-bar.

This Hungarian castle was built out of cardboard and wood until it proved so popular that it got upgraded to stone.

Once the home of a hermetic monk, this cave now houses a small church.

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

A series of caves under Castle Hill that once held the prisoner Vlad Tepes, better known as Count Dracula.

A historic and beautiful Art Nouveau chamber in a historic railway station.

Throughout this shopping mall are medieval ruins that were discovered during the mall's construction.

The palace window through which Protestant nobles flung two Catholic regents, thus sparking the Thirty Years' War.

A turn of the century building boasting some of the most beautiful art nouveau architecture in Prague.

The first museum in the world devoted to sexual gadgetry.

A cave in southern Italy adorned with thousand-year-old Biblical frescoes existed in obscurity until fairly recently.

Skulls and skeletons are omnipresent in this church dedicated to souls trapped in purgatory.

People have been living in the cave houses on this Italian hillside since the Neolithic era.

One of the few places of its kind, this space research center sits deep in the countryside of Matera.

An abandoned quarry hides an open-air gallery of huge sculptures, some made from the rubble of 9/11.

A dead saint, a deadly poison, and a mysterious holy ooze.

Southern Italy's spinning top village.