An 1814 castle that hosts an exhibit of "explorabilia".

A stunning Victorian abbey and walled garden on a lakefront.

A rocky Irish outcropping with a history of wealth, conflict, and ruin.

While only two of the ancient buildings at this site are actually churches this was one of the earliest Irish pilgrimage sites ever.

An ancient neolithic tomb that only sees the sun twice a year.

An unusual manor of stunning beauty, born out of a crippling disease.

A sacred well steeped in Pagan roots on the West Coast of Ireland.

This ancient Irish religious site is covered in ancient carvings, many of which have barely aged.

Local legend says the remains of Father Christmas lie within the medieval grounds.

One of the most popular megalithic sites in Ireland stands as a humbler version of Stonehenge.

The ancient tomb acts as a calendar that keeps perfect time.

This small square basin behind a quiet church was once a popular medieval pilgrimage site.

The house where Charles Darwin's grandfather formed many of his influential ideas and inventions.

These medieval carvings bear scars left by Parliamentarian troops during the English Civil War.

In the ruins of Glastonbury Abbey lies the alleged resting place of the legendary king.

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

Every hour on the hour a naked heroine and her leering foil appear from this giant cuckoo clock.

This hill and tower are steeped in legend, from King Arthur to the Holy Grail.

A measuring mishap led to these artificial stone ladies losing their stomachs.

Taxidermied animals galore, by appointment only.

This South London cemetery holds the remains of more than 15,000 people.

London's creepiest cemetery was once the site of dueling magicians and mobs of stake-carrying vampire hunters.

This little-known collection holds everything from "Dracula" notes, to the manuscript of "Ulysses," to the forged works of Shakespeare.

This palatial botanical garden is home to one of the largest pipe organs ever installed in a private residence, and a piece of Wood's cycad.