This sprawling concrete suburb of Kraków was designed by the Soviet Union as the model proletarian city.

St. Mary's features one of the most spectacularly decorated cathedral interiors in all of Europe.

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

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

Built in 1870 at the bridge that connected Buda and Pest, this spectacular incline railway was almost lost forever during World War II.

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.

Museum dedicated to the terror regimes of Hungary.

The Isle of Wight’s “Island Line” serviced by former London Underground trains from the 1930s.

A half-mile-long stretch of medieval forts built after a devastating pirate attack persists amid the modern port city.

Now a memorial to merchant sailors and Titanic victims, this medieval church was destroyed by bombing raids in 1940.

A building so large that it has its own weather.

If all members were present at the table, a sixth of the world's wealth would be under the same roof.

Hauled from the water's depths, Henry VIII's flagship is preserved in this capsule-shaped museum.

Famously misunderstood wonder of the ancient world

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

The highest peak in Wales is said to be the final resting place of a giant killed by King Arthur.

At Washington's Dulles Airport is a satellite museum (no pun intended) with three quarters of a million square feet of aircraft history.

The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.

Pop culture has helped to keep this iconic British building from being destroyed.

Six ravens are kept captive (but well-fed) at the Tower of London to prevent the fall of the Crown.

A 1,215-foot tunnel transports pedestrians beneath the River Thames.

One part local history, 99 parts gruesome haunted house.

Eighty million natural history specimens call this gargantuan museum home.