A vast overgrown cemetery, once known as one of London's "Magnificent Seven."

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

Colorful and chaotic stacked hotel in North Holland.

This historic Dutch newspaper building is covered with media-themed details—and one unrelated oddity.

The remains of the great moral philosopher reside in a university in London.

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

Catacombs turned marketplace.

A trio of red, white, and blue stones embedded in the streets of Leiden are markers of medieval territory and law.

The remains of a medieval wall discovered in the basement of a jewelry store.

'The Letters of Utrecht' lays out a ribbon of poetry one letter at a time, with no final verse in sight.

Goethe's "Faust" was inspired by these rock formations known as the "Devil's Pulpit" and "Witches' Altar."

On the highest peak in the Harz Mountains, science and the occult faced off in a failed attempt to turn a goat into a boy.

Elaborate tile work in this railway station tells the story of Portugal.

One of the most beautiful bookstores in the world hides a neo-Gothic interior behind an art nouveau facade.

Catering to broken dolls for almost 200 years, this repair shop is now a charnel house of doll parts.

Elaborately carved to showcase the glorious wealth that the age of exploration brought to the Portuguese empire.

A king's pet, a pope's gift, an artist's inspiration, and a tragic shipwreck.

An ancient and majestic fortress that played an integral role in Portugal's road to independence.

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

This unreal Portuguese palace looks as though it's made from a pile of different castles.

This former Baroque palace on the historic Calle Montcada is a rare architectural gem and was once the meeting place of an aristocratic scholarly society.

If a glacial river suddenly diving into a sheer chasm via a dramatic, multi-stage waterfall isn't peak Iceland, it's certainly close.

This valley of hot springs and boiling mud pots is home to the record-holding "Geysir," which originated the English word.

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