Sacked by Vikings, blessed by William the Conqueror, dealt a fatal blow during the French Revolution—these ruins have seen it all.

A cave dwelling that was started by the Celts, expanded by monks, and finished by knights.

One of the greatest maze designer’s greatest mazes.

Medieval museum built over Roman baths that features famous tapestries of a lady and a unicorn.

This whimsical castle of grottoes was the labor of love of a French postman, and one of the greatest achievements of outsider architecture.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

An ancient tomb that still stands in Portugal.

"Portugal's Stonehenge" is made up of nut-like stones aligned with the heavens.

A stunning 18th-century site where pilgrims ascend by a series of punishing stairs only to return via funicular.

One of the largest Roman settlements in Portugal.

The corpse bride of Portugal.

This fairy-tale, neo-Gothic church in the Azores is a world of magical realism.

The medieval castle built as headquarters for the Pope's secretive Knights Templar.

Picturesque intersection of witchcraft and ancient Christianity.

Houses are tucked between, on, and underneath giant boulders.

A formerly glacier-tipped volcano that inspired none other than Jules Verne.

This eye-popping Icelandic crater lake is surrounded by red volcanic rock.

Staves, storm-calling, and of course, necropants.

Built by King Norodom to honor his late father.

A battle between nature and architecture in the Cambodian jungle.

Founded over a thousand years ago, this shrine is said to be built on the site of a warlord's harem prison.

The tallest bronze seated statue of the Buddha in Japan.

Reportedly 1,400 years old, this may be the first of the Fiji Mermaids.

The magical, mossy forest that inspired Princess Mononoke.