At first glance, this area seems like just another city park, but the lush landscape hides a dark past.

In the midst of a living monument to Soviet social engineering, Polish Catholics built this church by hand.

Extremely famous in his native country, this Cracovian painter is all but unknown beyond Polish borders.

An artificial hill and apparent calendric structure built in the Early Middle Ages immortalizes a legendary Polish princess.

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

This man-made mound monument was built out of soil from all across the Polish empire.

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

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

This Polish cave has housed a dragon, a brothel, and an enduring legend.

Real bones which are said to have belonged to a Polish dragon.

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

The earliest known map to show America, discovered by accident at a Paris bookshop.

This macabre masterpiece of a mural is one of Francisco Goya's "Black Paintings."

This funky former tobacco factory is one of the most striking examples of Madrid's cultural diversity.

The lengthy skeleton of one of the tallest Spaniards of all time is on display in Madrid.

These three pillboxes still remain as a witness of the Spanish Civil War in a park of Madrid.

Remains of the lost church hide beneath this Spanish Parliament building.

The morbid items in this small and hidden museum are not for the weak stomached.

From Austrians to Nazis to Soviets, this historic Budapest fortress has a history as complex as the city itself.

This easily overlooked memorial immortalizes the scars from the 1956 Hungarian Revolution.

This statue of a falling man commemorates a teenage martyr of the Hungarian Revolution.

Electrical curiosity museum housed in an old transformer station.

A lovers' beach, tucked below the surface of the island, provides a safe haven for romance.

Late at night, the bust of the "Dracula" actor was snuck onto the facade of this Budapest castle.