Narrowest house in Boston.

This mysterious, medieval cathedral remains unbuilt but fiercely protected.

A hidden three-foot-wide house separates these two regal churches.

The skulls and bones of thousands of soldiers line the walls of this small Italian chapel.

The weathered grave of a medieval anchoress who walled herself up in a cell attached to a church.

An Oxford museum where visitors can have tea with the Mad Hatter and climb through the wardrobe to a fantasy land.

Home to the most complete dodo remains known - one head, and one foot.

This quaint mortuary chapel hides a stunning Celtic Revival and Art Nouveau interior.

Oxford University's stateliest library seems designed to make students truly feel the weight of knowledge.

The beams of the New College, Oxford dining hall come with an amazing story.

The beloved fantasy novelist is buried near a church containing a whimsical etched glass window full of Narnia favorites.

Inside the unassuming cemetery chapel is a magnificent stained glass window and mosaics.

Have a seat with the father of modern computing at this Manchester monument.

Be on the lookout for the symbolic insect all over the city.

A holy well supposedly infused with a saint's spirit flows within this quaint chapel.

A Parisian cemetery where the elite and artistic are interred beneath an eccentric collection of tombs.

An abandoned cemetery lies in ruins as the surrounding forest swallows it whole.

Louisa May Alcott based “Little Women” on her experiences growing up in this house with her sisters.

The farmhouse owned by the Danish author who wrote "Out of Africa" is now a museum honoring her legacy.

A seven-story 1920s mausoleum outside Denver houses thousands of remains.

Twice a day this ancient path disappears with the tides, leaving the Holy Island of Lindisfarne out to sea.

Decaying 18th-century church converted to a single-family home.

This museum honors the young maritime hero who became an unexpected Victorian-era celebrity.

This Upper East Side apartment co-op was designed as a tuberculosis sanitarium.