The beautiful baroque library of the Hapsburg empire.

The townhouse where the "Blood Countess" Elizabeth Báthory started her murderous career.

Giant WWII fortresses that fired 8,000 rounds a minute, now home to thousands of pigeons.

Macabre museum devoted to historical Viennese murders.

The final resting place for the remains of 143 Habsburg royalty.

The anatomical-pathological collection of a man who changed surgery.

17th century streets hidden under Edinburgh were once a breeding ground for the black death.

The perfectly preserved underground rooms where Churchill plotted the war against Germany.

The largest of London's subterranean rivers and once a mad, bad center of London life.

An eerie, derelict amusement park in Berlin.

The sign at the garden gate reads: "These Plants Can Kill."

80 years of the Battle of Peasholm on a small English lake.

The ghosts of Britain's telecommunication past sit rusting away in a small village in England.

Astonishing rock formations dot the Brimham Moor landscape.

WWII artifacts, including the building itself.

Once thought to be the mysterious work of a witchy prophetess, a well with unusual properties turns objects into "stone".

This lovely little burbling creek is actually a deadly waterway that has dragged down everyone who ever set foot in it.

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

The Stonehenge of Wales is one of the grandest neolithic dolmens still in existence.

A modest stone circle in North Wales.