These carved, weathered stones once gave mail carriers and pub goers a leg up.

This beautiful, historic church looks like something out of a simpler past.

The picturesque birthplace of Icelandic democracy is drenched in the blood of its brutal past.

Medicinal spa created from the mineral-rich runoff of a geothermal power plant

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

An ornate "graveyard" for some of the country's forlorn building relics.

This 17th-century street hidden beneath Edinburgh was once a breeding ground for the black death.

A labyrinthine network of chambers with a storied past hides below Edinburgh's South Bridge.

A tribute to a child prodigy who died way too young.

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

A cluttered and astounding collection of antiquities and curiosities.

The curios of pharmacist and collector Henry Wellcome.

The only university zoological museum in London houses extinct animals, bizarre natural history specimens, and a Micrarium of microscopic creatures.

A former smuggler's haven houses "The Chapel" and its mysterious carvings.

This centuries-old hotel hides a network of secret cellars and passages once used by smugglers.

An ancient water supply dating back almost 500 years can still be found standing in East Sussex.

Two gilded cherubs perched on a church bell tower have been reminding visitors of the finitude of life since 1760.

Also known as Rye Castle, this 13th-century fortification later became a prison and held one of Rye's most famous criminals.

This 18th-century "castle" is not what it seems.

The ceiling of this shopping arcade is adorned with six trompe-l’œil artworks, including a grim funeral scene.

Ancient Egyptian wigs, South American feather headdresses, a bounty of anthropological artifacts in Oxford.

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

Used as an example in one of the first dictionary entries for "museum" in 1706.

The lantern carried by the infamous Guy Fawkes when he was arrested while attempting to blow the houses of Parliament and the King of England to smithereens