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

This tall stone wall with no door and ill-matched windows was built centuries ago, and used as a shelter for domesticated pigeons.

The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.

Tucked among the sand dunes overlooking a Welsh beach, a real-life tribute to a fictional elf.

A spiral staircase connects the limestone cave with Pembroke Castle, birthplace of King Henry VII.

A hermit's tiny cell built into the cliffside that saved him in South Pembrokeshire.

A relatively obscure antihero from the Marvel Comics universe adorns a wall inside Iceland's main airport.

Gargoyle head that brings good luck.

These quintessentially English stepping stones were built for Victorian tourists.

An open air haven for tropical monkeys in the damp moors of the English country.

This fantastical and eclectic English garden takes its inspiration from Egypt, China, the occult and more.

This crumbling folly looks like an enchanted left over from Middle Earth.

This logic-defying 16th-century Tudor manor still stands to the delight and astonishment of onlookers.

A modern English garden of eccentric beasts, follies, and oddities.

A giant gleaming memorial named for a coal miner who gave his life to the pits.

In an arboretum with hundreds of memorials to the fallen, this one might be the most poignant.

A giant sculpture of the legendary "Salmon of Knowledge" celebrates the return of fish to Belfast's River Lagan.

Banksy's image of a naked man dangling from the window of a sex health clinic.

Although it appears ancient and mysterious, the quirky folly was actually built 200 years ago by an eccentric estate owner.

Once thought to be the mysterious work of a witchy prophetess, a well with unusual properties turns objects into "stone".

A fitting tribute to a beloved local boxing coach that's produced four world champions.

The oldest surviving glass furnace cone in Western Europe.

A collection of throne-inspired sculptures dot the landscape of Wincobank.

A folly built to satisfy a gentleman's bet that he could drive his horses through the eye of a needle.