This Norman castle has been the scene of assassination plots, religious persecution, and Nazi conspiracies throughout its long history.

One of England's most famous churches hides a pair of little known architectural treasures.

A beautiful ruin of a 14th-century Plantagenet castle built by a medieval mercenary.

Famously misunderstood wonder of the ancient world

Some call this eerie forest of crooked trees the "Bermuda Triangle of Romania."

Built in the 1300s, this magnificent building that hosted England's kings and queens transports you to the Middle Ages.

All that remains of the only English cathedral destroyed in the Protestant Reformation.

A preserved block of timber buildings from the city's industrial era in the Middle Ages.

A neo-Gothic church built to thank God for saving the Emperor of Austria from an assassination.

The beautiful baroque library of the Hapsburg empire.

Built by the patron saint of illusionists this Elizabethan manor house is riddled with secret cubbies for hiding priests.

A remarkable medieval structure born from a 14th-century disaster.

The mysterious, fantastical woodland inspiration for "The Lord of the Rings."

Ruined 11th century abbey built by King David I in Edinburgh, Scotland.

The gloomy ruins that inspired Bram Stoker to bring Dracula to life.

This 13th century castle is chock full of ghosts and impossibly rare cows.

Hidden in a grotto 26 feet below Nottingham's oldest hotel, this stylish subterranean drinking den is notoriously hard to find.

A charming 17th-century alley is lined with secondhand bookstores and antiquarian shops.

The sunken structure looks like the victim of a catastrophic flood.

Giant eggs, walls of bread, and nightmare surreality mark the largest collection of works by Salvador Dalí.

Take a stroll through the hellish grotesques of Hieronymus Bosch in this elaborate Netherlands church.

A 12th-century fortress containing some of Berlin's oldest buildings.

A small part of Russia that does not touch any other part of Russia.

This elaborately decorated, fairytale-like Romanian royal palace is one of the most striking castles in Europe.